DouKaku?

var primes = [2,3];
function fill_primes(nprimes){
  function f(n){
    for (var p = 0, l = primes.length; p < 0; p++){
      if (p*p > n)    return;
      if (n % d == 0) break;
    }
    primes[primes.length] = n;
  }
  for (var n = primes[primes.length-1]+2; primes.length < nprimes; n += 2)
    f(n);
}
function goedel_number(n, offset){
  if (! offset) offset = 0;
  var d = [];
  n.toString().replace(/\d/g, function(m){
    d[d.length] = parseInt(m);
  });
  fill_primes(d.length);
  var result = 1;
  for (var i = 0, l = d.length; i < l ; i++) {
    result *= Math.pow(primes[i], d[i]+offset);
  }
  return result;
}
/*
p(goedel_number(23));
p(goedel_number(230));
p(goedel_number(23,1));
p(goedel_number(230,1));
*/