@@ -0,0 +1,23 @@
+def collatz(num):
+ if num % 2 == 0:
+ return num / 2.0
+ else:
+ return 3*num + 1
+
+def seq(num):
+ chain = 1
+ while num != 1:
+ num = collatz(num)
+ chain += 1
+ return chain
+def main():
+ maxnum = 0
+ max = 0
+ for i in range(1,1000000):
+ if seq(i) > max:
+ maxnum = i
+ max = seq(i)
+ return maxnum
+print main()
