Faster Happy Numbers JavaScript

fasterHappyNumbers.js

//2014-02-10 jorge@jorgechamorro.com   Happy Numbers JavaScript

function sumaCuadrados (n) {
  var d, r= 0;
  while (n) n-= (d= n % 10), r+= d*d, n/= 10;
  return r;
}

function isHappy (n) {
   while (n && n!=1 && n!=4 && n!=16 && n!=37 && n!=58 && n!=89 && n!=145 && n!=42 && n!=20)
     n= sumaCuadrados(n);
   return n == 1;
}

var i, ctr= 0;
for (i=0 ; i<10000000 ; i++) isHappy(i) && ctr++;
console.log(ctr);