{"author_name":"inamori","blog_url":"https://inamori.hateblo.jp/","provider_name":"Hatena Blog","title":"Project Euler 38,39","url":"https://inamori.hateblo.jp/entry/20100210/p2","height":"190","categories":["Haskell"],"blog_title":"inamori\u2019s diary","provider_url":"https://hatena.blog","width":"100%","description":"Problem 38 http://projecteuler.net/index.php?section=problems&id=38 n\u3067\u5206\u3051\u308b\u3002\u305d\u306e\u3068\u304d\u5de6\u8fba\u7b2c\u4e00\u9805\u3092m\u3068\u3057\u3066\u3001m\u306e\u7bc4\u56f2\u304c\u6c7a\u307e\u308b\u3002\u4f8b\u3048\u3070\u3001n=4\u306a\u3089\u3001\u53f3\u8fba\u306f\u6700\u521d\u306e2\u3064\u306f3\u6841\u3067\u6b8b\u308a\u306f2\u6841\u3060\u304b\u3089\u3001 2m \u2265 100, 3m < 100 => 34 \u2264 m \u2264 50 range n = if k < n then [div (10^m + k) (k + 1) .. div (10^m - 1) k] else [10^(m-1) .. div (10^m - 1) n] where m = div 9 n k = n * (m + \u2026","version":"1.0","type":"rich","published":"2010-02-10 00:00:02","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20100210%2Fp2\" title=\"Project Euler 38,39 - inamori\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"author_url":"https://blog.hatena.ne.jp/inamori/"}