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/* cache key: enwiki:resourceloader:filter:minify-js:7:0993b889882537a818e40e18ad25b09d */ }</script> <script>if(window.mw){ mw.loader.load(["mediawiki.page.startup","mediawiki.legacy.wikibits","mediawiki.legacy.ajax","ext.centralauth.centralautologin","ext.visualEditor.viewPageTarget.init","wikibase.client.init","ext.centralNotice.bannerController","skins.vector.js"]); }</script> <script src="//bits.wikimedia.org/geoiplookup"></script><link rel="dns-prefetch" href="//meta.wikimedia.org"></head> <body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-42_number skin-vector action-view vector-animateLayout"> <div id="mw-page-base" class="noprint"></div> <div id="mw-head-base" class="noprint"></div> <div id="content" class="mw-body" role="main"> <a id="top"></a> <div id="mw-js-message" style="display:none;"></div> <div id="siteNotice"></div> <h1 id="firstHeading" class="firstHeading" lang="en"><span dir="auto">42 (number)</span></h1> <div id="bodyContent"> <div id="siteSub">From Wikipedia, the free encyclopedia</div> <div id="contentSub"><div id="mw-fr-revisiontag" class="flaggedrevs_short plainlinks noprint"><div class="flaggedrevs_short_basic"><img class="flaggedrevs-icon" src="//bits.wikimedia.org/static-1.23wmf10/extensions/FlaggedRevs/frontend/modules/img/doc-magnify.png" alt="Changes must be reviewed before being displayed on this page." title="Changes must be reviewed before being displayed on this page."><img id="mw-fr-revisiontoggle" class="fr-toggle-arrow" src="//bits.wikimedia.org/static-1.23wmf10/extensions/FlaggedRevs/frontend/modules/img/arrow-down.png" style="display:none;" alt="show/hide details"></div> <div id="mw-fr-revisiondetails-wrapper" style="position:relative;"><div id="mw-fr-revisiondetails" class="flaggedrevs_short_details" style="display:none">This is the <a href="/wiki/Wikipedia:Pending_changes" title="Wikipedia:Pending changes">latest accepted revision</a>, <a class="external text" href="//en.wikipedia.org/w/index.php?title=Special:Log&type=review&page=42_(number)">accepted</a> on <i>28 January 2014</i>.</div> </div> </div> </div> <div id="jump-to-nav" class="mw-jump"> Jump to: <a href="#mw-navigation">navigation</a>, <a href="#p-search">search</a> </div> <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="metadata topicon nopopups" id="protected-icon" style="display:none; right:25px;"><a href="/wiki/Wikipedia:Protection_policy#pc1" title="All edits by unregistered and new users are subject to review."><img alt="Page protected with pending changes level 1" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/20px-Padlock-silver-light.svg.png" width="20" height="20" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/30px-Padlock-silver-light.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/40px-Padlock-silver-light.svg.png 2x"></a></div> <div class="metadata topicon nopopups" id="protected-icon" style="display:none; right:25px;"><a href="/wiki/Wikipedia:Protection_policy#pc1" title="All edits by unregistered and new users are subject to review."><img alt="Page protected with pending changes level 1" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/20px-Padlock-silver-light.svg.png" width="20" height="20" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/30px-Padlock-silver-light.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/28/Padlock-silver-light.svg/40px-Padlock-silver-light.svg.png 2x"></a></div> <table class="metadata plainlinks ambox ambox-content ambox-Refimprove" role="presentation"> <tbody><tr> <td class="mbox-image"> <div style="width:52px;"><a href="/wiki/File:Question_book-new.svg" class="image"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" width="50" height="39" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x"></a></div> </td> <td class="mbox-text"><span class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>. <span class="hide-when-compact">Please help <a class="external text" href="//en.wikipedia.org/w/index.php?title=42_(number)&action=edit">improve this article</a> by <a href="/wiki/Help:Introduction_to_referencing/1" title="Help:Introduction to referencing/1">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.</span> <small><i>(February 2011)</i></small></span></td> </tr> </tbody></table> <table class="infobox" cellspacing="3" style="border-spacing:3px;width:22em;line-height: 1.5em;"> <tbody><tr> <th colspan="2" style="text-align:center;font-size:125%;font-weight:bold;font-size: 150%;"> <table style="width:100%; margin:0"> <tbody><tr> <td style="width:15%; text-align:left; white-space: nowrap; font-size:smaller"><a href="/wiki/41_(number)" title="41 (number)"><span class="Unicode">←</span> 41</a></td> <td style="width:70%; padding-left:1em; padding-right:1em">42</td> <td style="width:15%; text-align:right; white-space: nowrap; font-size:smaller"><a href="/wiki/43_(number)" title="43 (number)">43 <span class="Unicode">→</span></a></td> </tr> </tbody></table> </th> </tr> <tr> <td colspan="2" style="text-align:center;font-size:100%;;"> <div style="text-align:center;font-size:smaller;white-space:nowrap;"><a href="/wiki/39_(number)" title="39 (number)"><span class="Unicode">←</span></a> <a href="/wiki/40_(number)" title="40 (number)">40</a> <a href="/wiki/41_(number)" title="41 (number)">41</a> <strong class="selflink">42</strong> <a href="/wiki/43_(number)" title="43 (number)">43</a> <a href="/wiki/44_(number)" title="44 (number)">44</a> <a href="/wiki/45_(number)" title="45 (number)">45</a> <a href="/wiki/46_(number)" title="46 (number)">46</a> <a href="/wiki/47_(number)" title="47 (number)">47</a> <a href="/wiki/48_(number)" title="48 (number)">48</a> <a href="/wiki/49_(number)" title="49 (number)">49</a> <a href="/wiki/50_(number)" title="50 (number)"><span class="Unicode">→</span></a></div> <div style="text-align:center;font-size:smaller;white-space:nowrap;"><a href="/wiki/List_of_numbers" title="List of numbers">List of numbers</a> — <a href="/wiki/Integer" title="Integer">Integers</a></div> <div style="text-align:center;font-size:smaller;white-space:nowrap;"><a href="/wiki/Negative_number" title="Negative number"><span class="Unicode">←</span></a> <a href="/wiki/0_(number)" title="0 (number)">0</a> <a href="/wiki/10_(number)" title="10 (number)">10</a> <a href="/wiki/20_(number)" title="20 (number)">20</a> <a href="/wiki/30_(number)" title="30 (number)">30</a> <a href="/wiki/40_(number)" title="40 (number)">40</a> <a href="/wiki/50_(number)" title="50 (number)">50</a> <a href="/wiki/60_(number)" title="60 (number)">60</a> <a href="/wiki/70_(number)" title="70 (number)">70</a> <a href="/wiki/80_(number)" title="80 (number)">80</a> <a href="/wiki/90_(number)" title="90 (number)">90</a> <a href="/wiki/100_(number)" title="100 (number)"><span class="Unicode">→</span></a></div> </td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Cardinal_number_(linguistics)" title="Cardinal number (linguistics)">Cardinal</a></th> <td>forty-two</td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Ordinal_number_(linguistics)" title="Ordinal number (linguistics)">Ordinal</a></th> <td>42nd<br> (forty-second)</td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Factorization" title="Factorization">Factorization</a></th> <td><span class="texhtml" style="font-size:165%">2 · 3 · 7</span></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Divisor" title="Divisor">Divisors</a></th> <td>1, 2, 3, 6, 7, 14, 21, 42</td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Roman_numerals" title="Roman numerals">Roman numeral</a></th> <td>XLII</td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Unicode" title="Unicode">Unicode</a> symbol(s)</th> <td></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Greek_language" title="Greek language">Greek</a> <a href="/wiki/Numeral_prefix" title="Numeral prefix">prefix</a></th> <td>μβ</td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Binary_number" title="Binary number">Binary</a></th> <td>101010<sub>2</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Ternary_numeral_system" title="Ternary numeral system">Ternary</a></th> <td>1120<sub>3</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Quaternary_numeral_system" title="Quaternary numeral system">Quaternary</a></th> <td>222<sub>4</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Quinary" title="Quinary">Quinary</a></th> <td>132<sub>5</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Senary" title="Senary">Senary</a></th> <td>110<sub>6</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Octal" title="Octal">Octal</a></th> <td>52<sub>8</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Duodecimal" title="Duodecimal">Duodecimal</a></th> <td>36<sub>12</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Hexadecimal" title="Hexadecimal">Hexadecimal</a></th> <td>2A<sub>16</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Vigesimal" title="Vigesimal">Vigesimal</a></th> <td>22<sub>20</sub></td> </tr> <tr> <th scope="row" style="text-align:left;font-weight:normal;"><a href="/wiki/Base_36" title="Base 36">Base 36</a></th> <td>16<sub>36</sub></td> </tr> </tbody></table> <p><b>42</b> (<b>forty-two</b>) is the <a href="/wiki/Natural_number" title="Natural number">natural number</a> immediately following <a href="/wiki/41_(number)" title="41 (number)">41</a> and directly preceding <a href="/wiki/43_(number)" title="43 (number)">43</a>. The number has received considerable attention in popular culture as a result of its central appearance in <i><a href="/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy" title="The Hitchhiker's Guide to the Galaxy">The Hitchhiker's Guide to the Galaxy</a></i> as the "<a href="/wiki/Phrases_from_The_Hitchhiker%27s_Guide_to_the_Galaxy#Answer_to_the_Ultimate_Question_of_Life.2C_the_Universe.2C_and_Everything_.2842.29" title="Phrases from The Hitchhiker's Guide to the Galaxy">Answer to The Ultimate Question of Life, the Universe, and Everything</a>".</p> <p></p> <div id="toc" class="toc"> <div id="toctitle"> <h2>Contents</h2> </div> <ul> <li class="toclevel-1 tocsection-1"><a href="#Mathematics"><span class="tocnumber">1</span> <span class="toctext">Mathematics</span></a></li> <li class="toclevel-1 tocsection-2"><a href="#Science"><span class="tocnumber">2</span> <span class="toctext">Science</span></a></li> <li class="toclevel-1 tocsection-3"><a href="#Technology"><span class="tocnumber">3</span> <span class="toctext">Technology</span></a></li> <li class="toclevel-1 tocsection-4"><a href="#Astronomy"><span class="tocnumber">4</span> <span class="toctext">Astronomy</span></a></li> <li class="toclevel-1 tocsection-5"><a href="#Religion"><span class="tocnumber">5</span> <span class="toctext">Religion</span></a></li> <li class="toclevel-1 tocsection-6"><a href="#Popular_culture"><span class="tocnumber">6</span> <span class="toctext">Popular culture</span></a> <ul> <li class="toclevel-2 tocsection-7"><a href="#The_Hitchhiker.27s_Guide_to_the_Galaxy"><span class="tocnumber">6.1</span> <span class="toctext"><i>The Hitchhiker's Guide to the Galaxy</i></span></a></li> <li class="toclevel-2 tocsection-8"><a href="#Works_of_Lewis_Carroll"><span class="tocnumber">6.2</span> <span class="toctext">Works of Lewis Carroll</span></a></li> <li class="toclevel-2 tocsection-9"><a href="#Music"><span class="tocnumber">6.3</span> <span class="toctext">Music</span></a></li> <li class="toclevel-2 tocsection-10"><a href="#Television_and_film"><span class="tocnumber">6.4</span> <span class="toctext">Television and film</span></a></li> <li class="toclevel-2 tocsection-11"><a href="#Video_games"><span class="tocnumber">6.5</span> <span class="toctext">Video games</span></a></li> <li class="toclevel-2 tocsection-12"><a href="#Sports"><span class="tocnumber">6.6</span> <span class="toctext">Sports</span></a></li> </ul> </li> <li class="toclevel-1 tocsection-13"><a href="#Other_fields"><span class="tocnumber">7</span> <span class="toctext">Other fields</span></a></li> <li class="toclevel-1 tocsection-14"><a href="#Other_languages"><span class="tocnumber">8</span> <span class="toctext">Other languages</span></a></li> <li class="toclevel-1 tocsection-15"><a href="#References"><span class="tocnumber">9</span> <span class="toctext">References</span></a></li> <li class="toclevel-1 tocsection-16"><a href="#External_links"><span class="tocnumber">10</span> <span class="toctext">External links</span></a></li> </ul> </div> <p></p> <h2><span class="mw-headline" id="Mathematics">Mathematics</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=1" title="Edit section: Mathematics">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <ul> <li>Forty-two is a <a href="/wiki/Pronic_number" title="Pronic number">pronic number</a> and an <a href="/wiki/Abundant_number" title="Abundant number">abundant number</a>; its <a href="/wiki/Prime_factorization" title="Prime factorization" class="mw-redirect">prime factorization</a> 2 · 3 · 7 makes it the second <a href="/wiki/Sphenic_number" title="Sphenic number">sphenic number</a> and also the second of the form { 2 · 3 · <i>r</i> }. As with all sphenic numbers of this form, the <a href="/wiki/Aliquot_sum" title="Aliquot sum" class="mw-redirect">aliquot</a> sum is <a href="/wiki/Abundant_number" title="Abundant number">abundant</a> by 12. 42 is also the second sphenic number to be bracketed by <a href="/wiki/Twin_prime" title="Twin prime">twin primes</a>; <a href="/wiki/30_(number)" title="30 (number)">30</a> is also a pronic number and also rests between two primes. 42 has a 14 member <a href="/wiki/Aliquot_sequence" title="Aliquot sequence">aliquot sequence</a> 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0 and is itself part of the <a href="/wiki/Aliquot_sequence" title="Aliquot sequence">aliquot sequence</a> commencing with the first sphenic number <a href="/wiki/30_(number)" title="30 (number)">30</a>. Further, 42 is the 10th member of the 3-aliquot tree.</li> <li>It is the third <a href="/wiki/Primary_pseudoperfect_number" title="Primary pseudoperfect number">primary pseudoperfect number</a>.</li> <li>It is a <a href="/wiki/Catalan_number" title="Catalan number">Catalan number</a>. Consequently; 42 is the number of <a href="/wiki/Noncrossing_partition" title="Noncrossing partition">noncrossing partitions</a> of a set of five elements, the number of triangulations of a <a href="/wiki/Heptagon" title="Heptagon">heptagon</a>, the number of rooted ordered binary <a href="/wiki/Tree_(graph_theory)" title="Tree (graph theory)">trees</a> with six leaves, the number of ways in which five pairs of nested parentheses can be arranged, etc.</li> <li>It is the number of <a href="/wiki/Integer_partition" title="Integer partition" class="mw-redirect">partitions</a> of 10 - the number of ways of expressing 10 as a sum of positive integers (note a different sense of partition from that above).</li> </ul> <div class="thumb tright"> <div class="thumbinner" style="width:222px;"><a href="/wiki/File:Simple_Magic_Cube.svg" class="image"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Simple_Magic_Cube.svg/220px-Simple_Magic_Cube.svg.png" width="220" height="205" class="thumbimage" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Simple_Magic_Cube.svg/330px-Simple_Magic_Cube.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Simple_Magic_Cube.svg/440px-Simple_Magic_Cube.svg.png 2x"></a> <div class="thumbcaption"> <div class="magnify"><a href="/wiki/File:Simple_Magic_Cube.svg" class="internal" title="Enlarge"><img src="//bits.wikimedia.org/static-1.23wmf10/skins/common/images/magnify-clip.png" width="15" height="11" alt=""></a></div> The 3 × 3 × 3 magic cube with rows summing to 42.</div> </div> </div> <ul> <li>Given 27 same-size cubes whose nominal values progress from 1 to 27, a 3×3×3 <a href="/wiki/Magic_cube" title="Magic cube">magic cube</a> can be constructed such that every row, column, and corridor, and every diagonal passing through the center, is composed of 3 cubes whose sum of values is 42.</li> <li>It is the third <a href="/wiki/Polygonal_number" title="Polygonal number">pentadecagonal number</a>. It is a <a href="/wiki/Meander_(mathematics)" title="Meander (mathematics)">meandric number</a> and an <a href="/wiki/Meander_(mathematics)#Open_meandric_numbers" title="Meander (mathematics)">open meandric number</a>.</li> <li>It is conjectured to be the scaling factor in the <a href="/wiki/Leading-order" title="Leading-order" class="mw-redirect">leading order</a> term of the "sixth <a href="/wiki/Moment_(mathematics)" title="Moment (mathematics)">moment</a> of the <a href="/wiki/Bernhard_Riemann" title="Bernhard Riemann">Riemann</a> <a href="/wiki/Riemann_zeta_function" title="Riemann zeta function">zeta function</a>". In particular, Conrey & Ghosh have conjectured that <dl> <dd><img class="tex" alt="{1 \over T}\int_0^T \left| \zeta\left({1 \over 2} + it\right) \right|^6\,dt \sim {42 \over 9!}\prod_p \left\{1-{1\over p}\right\}^4 \left( 1 + {4 \over p} + {1 \over p^2} \right) \log^9 T, " src="//upload.wikimedia.org/math/1/3/2/1320f3da4bc6fc5145ffe081115518ce.png"></dd> <dd>.</dd> <dd>where the <a href="/wiki/Infinite_product" title="Infinite product">infinite product</a> is over all prime numbers, <i>p</i>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span>[</span>1<span>]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span>[</span>2<span>]</span></a></sup></dd> </dl> </li> <li>42 is a <a href="/wiki/St%C3%B8rmer_number" title="Størmer number">Størmer number</a>.</li> <li>In base 10, this number is a <a href="/wiki/Harshad_number" title="Harshad number">Harshad number</a> and a <a href="/wiki/Self_number" title="Self number">self number</a>, while it is a <a href="/wiki/Repdigit" title="Repdigit">repdigit</a> in base 4 (as 222).</li> <li>42 is the only known value that is the number of sets of four distinct positive integers a,b,c,d, each less than the value itself, such that ab-cd, ac-bd, and ad-bc are each multiples of the value. Whether there are other values remains an open question.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span>[</span>3<span>]</span></a></sup></li> <li>42 is a (2,6)-perfect number (<a href="/wiki/Superperfect_number" title="Superperfect number">super-multiperfect</a>), as <img class="tex" alt="\sigma^2(n)=\sigma(\sigma(n))=6n\," src="//upload.wikimedia.org/math/d/f/5/df5ef97b840bb2ebdc4826b287cf1aa7.png"><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span>[</span>4<span>]</span></a></sup></li> <li>42 is a perfect score on the USA Math Olympiad (<a href="/wiki/United_States_of_America_Mathematical_Olympiad" title="United States of America Mathematical Olympiad">USAMO</a>)<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span>[</span>5<span>]</span></a></sup> and <a href="/wiki/International_Mathematical_Olympiad" title="International Mathematical Olympiad">International Mathematical Olympiad</a> (IMO).<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span>[</span>6<span>]</span></a></sup></li> <li>42 is the maximum of core points awarded in International Baccalaureate Diploma Programme.</li> <li>42 is the resulting number of the original <a href="/wiki/Smith_number" title="Smith number">Smith number</a> (4937775): Both the sum of its digits (4+9+3+7+7+7+5) as the sum of the digits in its prime factorization (3+5+5+(6+5+8+3+7)) result in 42.</li> <li>The dimension of the <a href="/wiki/Borel_subalgebra" title="Borel subalgebra" class="mw-redirect">Borel subalgebra</a> in the <a href="/wiki/Exceptional_Lie_algebra" title="Exceptional Lie algebra" class="mw-redirect">exceptional Lie algebra</a> <a href="/wiki/E6_(mathematics)" title="E6 (mathematics)"><i>e</i><sub>6</sub></a> is 42.</li> </ul> <h2><span class="mw-headline" id="Science">Science</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=2" title="Edit section: Science">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <ul> <li>The <a href="/wiki/Atomic_number" title="Atomic number">atomic number</a> of <a href="/wiki/Molybdenum" title="Molybdenum">molybdenum</a>.</li> <li>The angle rounded to whole degrees for which a <a href="/wiki/Water_lens" title="Water lens" class="mw-redirect">rainbow</a> appears (the critical angle).</li> <li>In 1966, mathematician <a href="/w/index.php?title=Paul_Cooper_(mathematician)&action=edit&redlink=1" class="new" title="Paul Cooper (mathematician) (page does not exist)">Paul Cooper</a> theorized that the fastest, most efficient way to travel across continents would be to bore a straight hollow tube directly through the <a href="/wiki/Earth" title="Earth">Earth</a>, connecting a set of <a href="/wiki/Antipodes" title="Antipodes">antipodes</a>, remove the air from the tube and fall through.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span>[</span>7<span>]</span></a></sup> The first half of the journey consists of free-fall acceleration, while the second half consists of an exactly equal deceleration. The time for such a journey works out to be 42 minutes. Even if the tube does not pass through the exact center of the Earth, the time for a journey powered entirely by gravity (known as a <a href="/wiki/Gravity_train" title="Gravity train">gravity train</a>) always works out to be 42 minutes, so long as the tube remains friction-free, as while the force of gravity would be lessened, the distance traveled is reduced at an equal rate.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span>[</span>8<span>]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span>[</span>9<span>]</span></a></sup> (The same idea was proposed, without calculation by <a href="/wiki/Lewis_Carroll" title="Lewis Carroll">Lewis Carroll</a> in 1893 in <i><a href="/wiki/Sylvie_and_Bruno_Concluded" title="Sylvie and Bruno Concluded" class="mw-redirect">Sylvie and Bruno Concluded</a></i>.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span>[</span>10<span>]</span></a></sup>)</li> </ul> <h2><span class="mw-headline" id="Technology">Technology</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=3" title="Edit section: Technology">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <ul> <li><a href="/wiki/Magic_number_(programming)" title="Magic number (programming)">Magic numbers</a> used by <a href="/wiki/Programmer" title="Programmer">programmers</a>: <ul> <li>The glyph, or character, corresponding to the number 42 in the <a href="/wiki/Printable_characters" title="Printable characters" class="mw-redirect">ASCII</a> character set, is *, the <a href="/wiki/Asterisk" title="Asterisk">asterisk</a>, commonly known as the <a href="/wiki/Wildcard_character" title="Wildcard character">wildcard character</a>.</li> <li>In the <a href="/wiki/Tagged_Image_File_Format" title="Tagged Image File Format">TIFF</a> image file format, the second <a href="/wiki/16-bit" title="16-bit">16-bit</a> <a href="/wiki/Word_(data_type)" title="Word (data type)" class="mw-redirect">word</a> of every file is 42, which is used together with the first word to indicate <a href="/wiki/Endianness" title="Endianness">byte order</a>.</li> <li>In the <a href="/wiki/Reiser4" title="Reiser4">reiser4</a> file system, 42 is the <a href="/wiki/Inode" title="Inode">inode</a> number of the <a href="/wiki/Root_directory" title="Root directory">root directory</a>.</li> <li>In the military <a rel="nofollow" class="external text" href="http://www.irig106.org/docs/106-09/chapter10.pdf">IRIG 106 Chapter 10</a> data recording standard, the hex value 0x464F52545974776F (ASCII "FORTYtwo") is used as a magic number to identify directory blocks.</li> </ul> </li> <li>The <a href="/wiki/GNU_C_Library" title="GNU C Library">GNU C Library</a>, a set of standard routines available for use in <a href="/wiki/Computer_programming" title="Computer programming">computer programming</a>, contains a <a href="/wiki/Subroutine" title="Subroutine">function</a>—<b><tt>memfrob()</tt></b>—which performs an <a href="/wiki/Exclusive_or" title="Exclusive or">XOR</a> combination of a given variable and the <a href="/wiki/Binary_numeral_system" title="Binary numeral system" class="mw-redirect">binary</a> pattern 00101010 (42) as an <a href="/wiki/XOR_cipher" title="XOR cipher">XOR cipher</a>.</li> <li>42 is the result given by the <a href="/wiki/Web_search_engine" title="Web search engine">web search engines</a> <a href="/wiki/Google" title="Google">Google</a> and <a href="/wiki/Wolfram_Alpha" title="Wolfram Alpha">Wolfram Alpha</a> when the query "<a href="/wiki/The_answer_to_life_the_universe_and_everything" title="The answer to life the universe and everything" class="mw-redirect">the answer to life the universe and everything</a>" is entered as a search.</li> <li><a href="/wiki/Hexagonal_tiling" title="Hexagonal tiling">Tiling a plane using regular hexagons</a>, which is <a href="/wiki/Honeycomb" title="Honeycomb">honeycomb</a> in appearance, is approximated in a <a href="/wiki/Hexagonal_tiling#Topologically_identical_tilings" title="Hexagonal tiling">topological sense</a> to an accuracy of better than 1% using a <a href="/wiki/Brickwork#Bonds" title="Brickwork">stretcher bond brick pattern</a> with bricks of 42 squares (6 by 7).<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span>[</span>11<span>]</span></a></sup></li> <li>The password expiration policy for a <a href="/wiki/Windows_domain" title="Windows domain">Microsoft Windows domain</a> defaults to 42 days.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span>[</span>12<span>]</span></a></sup></li> </ul> <h2><span class="mw-headline" id="Astronomy">Astronomy</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=4" title="Edit section: Astronomy">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <ul> <li><a href="/wiki/Messier_object" title="Messier object">Messier object</a> <a href="/wiki/Orion_Nebula" title="Orion Nebula">M42</a>, a <a href="/wiki/Apparent_magnitude" title="Apparent magnitude">magnitude</a> 5.0 <a href="/wiki/Diffuse_nebula" title="Diffuse nebula" class="mw-redirect">diffuse nebula</a> in the <a href="/wiki/Constellation" title="Constellation">constellation</a> <a href="/wiki/Orion_(constellation)" title="Orion (constellation)">Orion</a>, also known as the <a href="/wiki/Orion_Nebula" title="Orion Nebula">Orion Nebula</a></li> <li>The <a href="/wiki/New_General_Catalogue" title="New General Catalogue">New General Catalogue</a> object NGC 42, a <a href="/wiki/Spiral_galaxy" title="Spiral galaxy">spiral galaxy</a> in the constellation <a href="/wiki/Pegasus_(constellation)" title="Pegasus (constellation)">Pegasus</a></li> <li>In January 2004, <a href="/wiki/Asteroid" title="Asteroid">asteroid</a> <span class="nowrap">2001 DA<sub>42</sub></span> was given the permanent name <a href="/wiki/25924_Douglasadams" title="25924 Douglasadams">25924 Douglasadams</a>, for the author <a href="/wiki/Douglas_Adams" title="Douglas Adams">Douglas Adams</a> who popularized the number 42 and died in 2001. <a href="/wiki/Brian_G._Marsden" title="Brian G. Marsden">Brian G. Marsden</a>, the director of the <a href="/wiki/Minor_Planet_Center" title="Minor Planet Center">Minor Planet Center</a> and the secretary for the naming committee, remarked that, with even his initials in the provisional designation, "This was sort of made for him, wasn't it?"</li> <li><a href="/wiki/Kepler-42" title="Kepler-42">Kepler-42</a>, a red dwarf in the constellation <a href="/wiki/Cygnus_(constellation)" title="Cygnus (constellation)">Cygnus</a> around which orbits the three smallest <a href="/wiki/Exoplanets" title="Exoplanets" class="mw-redirect">exoplanets</a> found to date.</li> </ul> <h2><span class="mw-headline" id="Religion">Religion</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=5" title="Edit section: Religion">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <ul> <li>In Japanese culture, the number 42 is considered unlucky because the numerals when pronounced separately — "shi ni" (four two) — sound like the phrase, "unto death".<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span>[</span>13<span>]</span></a></sup></li> <li>There are 42 principles of <a href="/wiki/Ma%27at" title="Ma'at" class="mw-redirect">Ma'at</a>, the Ancient Egyptian personification of physical and moral law, order, and truth. In the judgment scene described in the Egyptian and the Book of the Coming/Going Forth by Day (the <a href="/wiki/Book_of_the_Dead" title="Book of the Dead">Book of the Dead</a> (which evolved from the <a href="/wiki/Coffin_Texts" title="Coffin Texts">Coffin Texts</a> and the <a href="/wiki/Pyramid_Texts" title="Pyramid Texts">Pyramid Texts</a>)), there are 42 gods and goddesses of Egypt, personifying the principles of <a href="/wiki/Ma%27at" title="Ma'at" class="mw-redirect">Ma'at</a>. These 42 correspond to the 42 <a href="/wiki/Nome_(Egypt)" title="Nome (Egypt)">Nomes</a> (Governmental Units) of Egypt. If the departed successfully answers all 42, s/he becomes an <a href="/wiki/Osiris" title="Osiris">Osiris</a>.</li> <li>42 is the number with which God creates the Universe in <a href="/wiki/Kabbalah" title="Kabbalah">Kabbalistic tradition</a>. In Kabbalah, the most significant name is that of the En Sof (also known as "<a href="/wiki/Ein_Sof" title="Ein Sof">Ein Sof</a>", "Infinite" or "Endless"), who is above the Sefirot (sometimes spelled "<a href="/wiki/Sephirot" title="Sephirot">Sephirot</a>").<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span>[</span>14<span>]</span></a></sup> The Forty-Two-Lettered Name contains four combined names which are spelled in Hebrew letters (spelled in letters = 42 letters), which is the name of Azilut (or "<a href="/wiki/Atziluth" title="Atziluth">Atziluth</a>" "Emanation"). While there are obvious links between the Forty-Two Lettered Name of the Babylonian Talmud and the Kabbalah's Forty-Two Lettered Name, they are probably not identical because of the Kabbalah's emphasis on numbers. The Kabbalah also contains a Forty-Five Lettered Name and a Seventy-Two Lettered Name.</li> <li>The number 42 appears in various contexts in <a href="/wiki/Christianity" title="Christianity">Christianity</a>. There are 42 generations (names) in the <a href="/wiki/Gospel_of_Matthew" title="Gospel of Matthew">Gospel of Matthew</a>'s version of the <a href="/wiki/Genealogy_of_Jesus" title="Genealogy of Jesus">Genealogy of Jesus</a>; it is prophesied that for 42 months the <a href="/wiki/The_Beast_(Revelation)" title="The Beast (Revelation)" class="mw-redirect">Beast</a> will hold dominion over the Earth (<a href="/wiki/Book_of_Revelation" title="Book of Revelation">Revelation</a> 13:5); 42 men of Beth-azmaveth were counted in the <a href="/wiki/Census" title="Census">census</a> of men of <a href="/wiki/Israel" title="Israel">Israel</a> upon return from exile (<a href="/wiki/Book_of_Ezra" title="Book of Ezra">Ezra</a> 2:24); <a href="/wiki/God" title="God">God</a> sent bears to maul 42 of the teenage boys who mocked <a href="/wiki/Elisha" title="Elisha">Elisha</a> for his baldness (<a href="/wiki/Books_of_Kings" title="Books of Kings">2 Kings</a> 2:23), etc.</li> <li>In <a href="/wiki/Judaism" title="Judaism">Judaism</a>, the number (in the <i>Babylonian Talmud</i>, compiled 375 AD to 499 AD) of the "Forty-Two Lettered Name" ascribed to God. Rab (or Rabhs), a 3rd-century source in the Talmud stated "The Forty-Two Lettered Name is entrusted only to him who is pious, meek, middle-aged, free from bad temper, sober, and not insistent on his rights". [Source: <i>Talmud Kidduschin</i> 71a, Translated by Rabbi Dr. I. Epstein]. <a href="/wiki/Maimonides" title="Maimonides">Maimonides</a> felt that the original Talmudic Forty-Two Lettered Name was perhaps composed of several combined divine names [Maimonides "Moreh"]. The apparently unpronouncable <a href="/wiki/Tetragrammaton" title="Tetragrammaton">Tetragrammaton</a> provides the backdrop from the Twelve-Lettered Name and the Forty-Two Lettered Name of the Talmud.<sup class="Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (February 2011)">citation needed</span></a></i>]</sup></li> <li>The <a href="/wiki/Gutenberg_Bible" title="Gutenberg Bible">Gutenberg Bible</a> is also known as the "42-line Bible", as the book contained 42 lines per page.</li> <li>The <a href="/wiki/Forty-Two_Articles" title="Forty-Two Articles" class="mw-redirect">Forty-Two Articles (1552)</a>, largely the work of <a href="/wiki/Thomas_Cranmer" title="Thomas Cranmer">Thomas Cranmer</a>, were intended to summarise Anglican doctrine, as it now existed under the reign of <a href="/wiki/Edward_VI" title="Edward VI" class="mw-redirect">Edward VI</a>.</li> </ul> <h2><span class="mw-headline" id="Popular_culture">Popular culture</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=6" title="Edit section: Popular culture">edit</a><span class="mw-editsection-bracket">]</span></span></h2> <h3><span class="mw-headline" id="The_Hitchhiker.27s_Guide_to_the_Galaxy"><i>The Hitchhiker's Guide to the Galaxy</i></span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=7" title="Edit section: The Hitchhiker's Guide to the Galaxy">edit</a><span class="mw-editsection-bracket">]</span></span></h3> <p>The number 42 is, in <i><a href="/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy" title="The Hitchhiker's Guide to the Galaxy">The Hitchhiker's Guide to the Galaxy</a></i> by <a href="/wiki/Douglas_Adams" title="Douglas Adams">Douglas Adams</a>, "The <a href="/wiki/Phrases_from_The_Hitchhiker%27s_Guide_to_the_Galaxy#Answer_to_the_Ultimate_Question_of_Life.2C_the_Universe.2C_and_Everything_.2842.29" title="Phrases from The Hitchhiker's Guide to the Galaxy">Answer to the Ultimate Question of Life, the Universe, and Everything</a>", calculated by <a href="/wiki/Deep_Thought_(The_Hitchhiker%27s_Guide_to_the_Galaxy)" title="Deep Thought (The Hitchhiker's Guide to the Galaxy)" class="mw-redirect">an enormous supercomputer</a> over a period of 7.5 million years. Unfortunately no one knows what the question is. Thus, to calculate the Ultimate Question, a special computer the size of a small planet and built from organic components was created and named "Earth". This appeared first in the <a href="/wiki/Radio_play" title="Radio play" class="mw-redirect">radio play</a> and later in the novelization of <i>The Hitchhiker's Guide to the Galaxy</i>. The fourth book in the series, the novel <i><a href="/wiki/So_Long,_and_Thanks_for_All_the_Fish" title="So Long, and Thanks for All the Fish">So Long, and Thanks for All the Fish</a></i>, contains 42 chapters. According to the novel <i><a href="/wiki/Mostly_Harmless" title="Mostly Harmless">Mostly Harmless</a></i>, 42 is the street address of <a href="/wiki/Places_in_The_Hitchhiker%27s_Guide_to_the_Galaxy#Stavromula_Beta" title="Places in The Hitchhiker's Guide to the Galaxy">Stavromula Beta</a>. In 1994 Adams created the <i><a href="/wiki/42_Puzzle" title="42 Puzzle" class="mw-redirect">42 Puzzle</a></i>, a game based on the number 42.</p> <p>The book <i>42: Douglas Adams' Amazingly Accurate Answer to Life, the Universe and Everything</i><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span>[</span>15<span>]</span></a></sup> examines Adams' choice of the number 42 and also contains a compendium of some instances of the number in science, popular culture, and humour.</p> <h3><span class="mw-headline" id="Works_of_Lewis_Carroll">Works of Lewis Carroll</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=8" title="Edit section: Works of Lewis Carroll">edit</a><span class="mw-editsection-bracket">]</span></span></h3> <p><a href="/wiki/Lewis_Carroll" title="Lewis Carroll">Lewis Carroll</a><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span>[</span>16<span>]</span></a></sup> made repeated use of this number in his writings.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span>[</span>17<span>]</span></a></sup></p> <p>Examples of Carroll's use of 42:</p> <ul> <li>Alice's Adventures in Wonderland has 42 illustrations.</li> <li>Rule Forty-two in <a href="/wiki/Alice%27s_Adventures_in_Wonderland" title="Alice's Adventures in Wonderland">Alice's Adventures in Wonderland</a> ("All persons more than a mile high to leave the court").</li> <li>Rule 42 of the Code in the preface<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span>[</span>18<span>]</span></a></sup> to <a href="/wiki/The_Hunting_of_the_Snark" title="The Hunting of the Snark">The Hunting of the Snark</a> ("No one shall speak to the Man at the Helm").</li> <li>In "fit the first" of <a href="/wiki/The_Hunting_of_the_Snark" title="The Hunting of the Snark">The Hunting of the Snark</a> the Baker had "forty-two boxes, all carefully packed, With his name painted clearly on each."<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span>[</span>19<span>]</span></a></sup></li> <li>The White Queen announces her age as "one hundred and one, five months and a day", which - if the best possible date is assumed for the action of <i>Through the Looking-Glass</i> - gives a total of 37,044 days. With the further (textually unconfirmed) assumption that both Queens were born on the same day their combined age becomes 74,088 days, which is 42 x 42 x 42. Some commentators have asserted that this is deliberate on Carroll's part.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span>[</span>20<span>]</span></a></sup></li> </ul> <h3><span class="mw-headline" id="Music">Music</span><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=42_(number)&action=edit&section=9" title="Edit section: Music">edit</a><span class="mw-editsection-bracket">]</span></span></h3> <ul> <li><a href="/wiki/Level_42" title="Level 42">Level 42</a> is an English <a href="/wiki/Pop_music" title="Pop music">pop</a>/<a href="/wiki/Rock_music" title="Rock music">rock</a> music band.</li> <li>"<a href="/wiki/42_(song)" title="42 (song)">42</a>" is one of the tracks on <a href="/wiki/Coldplay" title="Coldplay">Coldplay</a>'s 2008 album <i><a href="/wiki/Viva_la_Vida_or_Death_and_All_His_Friends" title="Viva la Vida or Death and All His Friends">Viva la Vida or Death and All His Friends</a></i>.</li> <li>"<a href="/wiki/Channel_42_(song)" title="Channel 42 (song)">Channel 42</a>" is a track from <a href="/wiki/Deadmau5" title="Deadmau5">deadmau5</a>' 2012 album <i><a href="/wiki/Album_Title_Goes_Here" title="Album Title Goes Here">Album Title Goes Here</a></i>.</li> <li>"<a href="/wiki/42_(song)" title="42 (song)">42</a>" is a track by <a href="/wiki/The_Disco_Biscuits" title="The Disco Biscuits" class="mw-redirect">The Disco Biscuits</a> and was written by "<a href="/wiki/Marc_Brownstein" title="Marc Brownstein">Marc Brownstein</a>".</li> </ul> <h3><span class="mw-headli