#!/usr/bin/python3 # mari von steinkirch @2013 # steinkirch at gmail def power_digit_sum(n): number = str(2**n) sum_res = 0 for i in number: sum_res += int(i) return sum_res def test_(): assert(power_digit_sum(15) == 26) print(power_digit_sum(1000)) print('Tests Passed!') if __name__ == '__main__': test_()