A-M baby

Task/Happy-numbers/Python/happy-numbers.py

@@ -0,0 +1,11 @@
+>>> def happy(n):
+    past = set()			
+    while n <> 1:
+        n = sum(int(i)**2 for i in str(n))
+        if n in past:
+            return False
+        past.add(n)
+    return True
+
+>>> [x for x in xrange(500) if happy(x)][:8]
+[1, 7, 10, 13, 19, 23, 28, 31]