#!/usr/bin/env python from helpers.utils import sig print sum(i for i in range(1, 10000) if sig(sig(i)) == i and i != sig(i))
#!/usr/bin/env python from helpers.utils import sig ab = [i for i in range(1, 28123) if sig(i) > i] ab_s = set(ab) def is_sum(n): for i in ab: if i > n: return False if (n - i) in ab_s: return True return False print sum(i for i in range(1, 28123) if not is_sum(i))