A method for Number Native MooTools, using sieve of Eratosthenes, identifies all prime numbers up to a given number n.
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A prime number is a natural number greater than 1 that can be divided without remainder only by itself and by 1. Natural numbers n that can be divided by a number less than n and greater than 1 are composite numbers. Sieve of Eratosthenes identifies all prime numbers up to a given number n. The algorithm works as follows: write the numbers 1, 2, 3,4 ,..., n and will eliminate composites by marking them (initially all numbers are unmarked). This is exactly what the method does using bitwise operations.


How to use

First you must to include the JS files in the head of your HTML document.

<script type="text/javascript" src="mootools.js"></script>
<script type="text/javascript" src="number.toEratosthenes.js"></script>

In your JavaScript code.

        $('f').addEvent('submit', function(e){
            if(e) {e.stop();}
            var n = $('n').get('value').toInt(); 
            if(!n) {return false;}
               var vec = [];
                   vec = (n).toEratosthenes(); 
               var s = ''; 
                   for(var i=0;i<vec.length;i++) {
                       s += vec[i] + ', ';

In your HTML code.

<form id="f" name="f">
<label for="n">N = </label><input type="text" id="n" value="100"/><input type="submit" value="go">
<div id="primenumbers"></div>