primejs/index.js

A library for prime number miscellany

var math = require('mathjs');

module.exports.PrimeCounting = {
  /**
   * Legendre prime counting function with B = 1
   *
   * @param Number or String
   * @return math.bignumber
   */
  Legendre: function(x) {
    var y = math.bignumber(x.toString());
    return math.chain(y)
      .divide(
        math.subtract(math.log(y), 1)
      )
      .done();
  }
};