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  <author_name>tanakaBox</author_name>
  <author_url>https://blog.hatena.ne.jp/tanakaBox/</author_url>
  <blog_title>ボクノス</blog_title>
  <blog_url>https://boxnos.hatenablog.com/</blog_url>
  <categories>
    <anon>Scheme</anon>
  </categories>
  <description>100の階乗Problem 20 - PukiWiki n × (n - 1) × ... × 3 × 2 × 1 を n! と表す。100! の各桁の数字の合計を求めよ。 簡単。 前に作ったユーティリティを利用して、 (define (number-&gt;list n) (define (iter acc n) (let ((q (quotient n 10)) (m (cons (modulo n 10) acc))) (if (zero? q) m (iter m q)))) (iter '() n)) (apply + (number-&gt;list (apply * (iota 100 1)…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2008-04-06 16:20:11</published>
  <title> Problem 20 - 100!</title>
  <type>rich</type>
  <url>https://boxnos.hatenablog.com/entry/20080406/1207466411</url>
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