{"blog_title":"inamori\u2019s diary","provider_name":"Hatena Blog","published":"2010-02-19 00:00:01","blog_url":"https://inamori.hateblo.jp/","author_name":"inamori","provider_url":"https://hatena.blog","version":"1.0","height":"190","type":"rich","image_url":null,"categories":["Haskell"],"description":"Problem 52 http://projecteuler.net/index.php?section=problems&id=52 6\u500d\u3057\u3066\u3082\u6841\u304c\u4e0a\u304c\u3089\u306a\u3044\u3053\u3068\u3092\u5229\u7528\u3059\u308b\u3002 import Data.List digits 0 = [] digits n = (digits (div n 10)) ++ [mod n 10] normalize = sort . digits is_valid n = f n 2 where m = normalize n f n 7 = True f n k | (normalize (n * k)) == m = f n (k + 1) | otherw\u2026","url":"https://inamori.hateblo.jp/entry/20100219/p2","author_url":"https://blog.hatena.ne.jp/inamori/","width":"100%","title":"Project Euler 52,53","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20100219%2Fp2\" title=\"Project Euler 52,53 - 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>"}