The Tor Browser / file revision

 // The Great Computer Language Shootout

 // http://shootout.alioth.debian.org/

 //

 // modified by Isaac Gouy

 function pad(number,width){

    var s = number.toString();

    var prefixWidth = width - s.length;

    if (prefixWidth>0){

       for (var i=1; i<=prefixWidth; i++) s = " " + s;

    }

    return s;

 }

 function nsieve(m, isPrime){

    var i, k, count;

    for (i=2; i<=m; i++) { isPrime[i] = true; }

    count = 0;

    for (i=2; i<=m; i++){

       if (isPrime[i]) {

          for (k=i+i; k<=m; k+=i) isPrime[k] = false;

          count++;

       }

    }

    return count;

 }

 var ret = 0;

 function sieve() {

     for (var i = 1; i <= 3; i++ ) {

         var m = (1<<i)*10000;

         var flags = Array(m+1);

         ret += nsieve(m, flags);

     }

 }

 sieve();

 assertEq(ret, 14302)