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【Project Euler】Problem 20: 階乗の数字和

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  • 本記事はProjectEulerの「100番以下の問題の説明は記載可能」という規定に基づいて回答のヒントが書かれていますので、自分である程度考えてみてから読まれることをお勧めします。

問題 20. 階乗の数字和

原文 Problem 20: Factorial digit sum

問題の要約:100!の数字和を求めよ

これも簡単で数字和は「Problem 16: 2のべき乗の数字和」で作った関数digitsumを使います。

import math
print(f"Answer : {digitsum(math.factorial(100))}")

(開発環境:Google Colab)

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