Project Euler 16

problem

2 to the 15th power = 32768, and the sum of the numbers (the sum of each digit) is 3 + 2 + 7 + 6 + 8 = 26.

In the same way, find the sum of 2 to the 1000th power. http://odz.sakura.ne.jp/projecteuler/index.php?cmd=read&page=Problem%2016

Answer

Practice using the map () function.

def main():
  t = 2**1000
  ans = sum(map(lambda x : int(x), str(t)))
  print ans

Postscript: Mathematical approach (N is a number that represents a decimal number, in this question it is a decimal number)

def main2():
  t = 2**1000
  N = 10
  ans = 0
  while t:
    (t, r) = (t//N, t%N)
    ans += r
  print ans

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