Trying to fix issues raised at build mgechev#100

Author: ysharplanguage

src/primes/prime-factor-tree.js

@@ -18,19 +18,29 @@
    * console.log(primeFactorTree(600851475143)); // [71, 839, 1471, 6857]
    */
   exports.primeFactorTree = function (number) {
-    var div = 2;
     var array = [];
-
-    while (number > 1) {
-      if (number % div === 0) {
-        number /= div;
-
-        array.push(div);
-      } else {
-        div += 1;
+    var s = 6;
+    while (number > 1 && number % 2 === 0) {
+      number /= 2;
+      array.push(2);
+    }
+    while (number > 2 && number % 3 === 0) {
+      number /= 3;
+      array.push(3);
+    }
+    while (number > 4) {
+      var p = s - 1;
+      var q = s + 1;
+      while (number > 4 && number % p === 0) {
+        number /= p;
+        array.push(p);
+      }
+      while (number > 4 && number % q === 0) {
+        number /= q;
+        array.push(q);
       }
+      s += 6;
     }
-
     return array;
   };