jmtame

// http://ejohn.org/apps/learn/#20
// caching results from a js function

function isPrime( num ) {
  var prime = num != 1; // Everything but 1 can be prime
  
  if (isPrime.cache[num]) {
    result = isPrime.cache[num];
  } else {
    for ( var i = 2; i < num; i++ ) {