Here is some JavaScript program code in a <code> element:

var n = 1 search: while (true) { n += 1 for (var i = 2; i <= Math.sqrt(n); i += 1) if (n % i == 0) continue search; postMessage(n); }

Here is some JavaScript program code in a <pre> element:

      var n = 1

      search: while (true)
      {
        n += 1

        for (var i = 2; i <= Math.sqrt(n); i += 1)
          if (n % i == 0) continue search;
        postMessage(n);
      }