''' The number, 1406357289, is a 0 to 9 pandigital number because it is made up of each of the digits 0 to 9 in some order, but it also has a rather interesting sub-string divisibility property. Let d1 be the 1st digit, d2 be the 2nd digit, and so on. In this way, we note the following: d2d3d4=406 is divisible by 2 d3d4d5=063 is divisible by 3 d4d5d6=635 is divisible by 5 d5d6d7=357 is divisible by 7 d6d7d8=572 is divisible by 11 d7d8d9=728 is divisible by 13 d8d9d10=289 is divisible by 17 Find the sum of all 0 to 9 pandigital numbers with this property. ''' from itertools import permutations def listToNum(l): s = ''.join(map(str, l)) return int(s) def check(l): primes = [2, 3, 5, 7, 11, 13, 17] for i in range(1, 8): # print(listToNum(l[i:i+3])) if listToNum(l[i:i+3]) % primes[i-1] != 0: return False return True def main(): print("Hello this is Patrick") summand = 0 # print(check(list(map(int, str(1406357289))))) for p in permutations(range(10)): if check(p): summand += listToNum(p) print(summand) if __name__ == "__main__": main()