Another update from ingydotnet^djgoku

Task/Iterated-digits-squaring/Python/iterated-digits-squaring-5.py

@@ -0,0 +1,20 @@
+from __future__ import print_function
+from itertools import count
+
+def check89(n):
+    while True:
+        n, t = 0, n
+        while t: n, t = n + (t%10)**2, t//10
+        if n <= 1: return False
+        if n ==89: return True
+
+a, sq, is89 = [1], [x**2 for x in range(1, 10)], [False]
+for n in range(1, 500):
+    b, a = a, a + [0]*81
+    is89 += map(check89, range(len(b), len(a)))
+
+    for i,v in enumerate(b):
+        for s in sq: a[i + s] += v
+
+    x = sum(a[i] for i in range(len(a)) if is89[i])
+    print("10^%d" % n, x)