{"blog_url":"https://mzp.hatenadiary.org/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmzp.hatenadiary.org%2Fentry%2F20070616%2Fperfect\" title=\"\u5b8c\u5168\u6570 - \u307f\u305a\u3074\u30fc\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"mzp","categories":["Haskell"],"provider_name":"Hatena Blog","height":"190","version":"1.0","published":"2007-06-16 00:00:01","description":"http://www.agusa.i.is.nagoya-u.ac.jp/person/mzp/hiki/?exercise\u306b\u66f8\u3044\u305f\u554f\u984c\u306e\u691c\u8a3c\u7528\u3002 \u5b8c\u5168\u6570\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3051\u3002\u5b8c\u5168\u6570(perfect number)\u3068\u306f\u3001\u305d\u306e\u6570\u5b57\u81ea\u8eab\u3092\u9664\u304f\u7d04\u6570(divisor)\u306e\u548c\u304c\u3001\u305d\u306e\u6570\u5b57\u81ea\u8eab\u306b\u306a\u308b\u6570\u5b57\u306e\u3053\u3068\u3002\u4f8b: 6 = 1+2+3 28 = 1+2+4+7+14 496 = 1+2+4+8+16+31+62+124+248 divisor n = filter (\\x-> n `mod` x == 0) [1..n] perfect n = (n*2) == (sum $ divisor \u2026","provider_url":"https://hatena.blog","type":"rich","url":"https://mzp.hatenadiary.org/entry/20070616/perfect","width":"100%","title":"\u5b8c\u5168\u6570","author_url":"https://blog.hatena.ne.jp/mzp/","image_url":null,"blog_title":"\u307f\u305a\u3074\u30fc\u65e5\u8a18"}