{"description":"\u3053\u306e\u7a0b\u5ea6\u306e\u5927\u304d\u3055\u306e\u6570\u306a\u3089\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u5b9f\u6570\u306e\u8a08\u7b97\u306b\u306f\u3069\u3046\u3057\u3066\u3082\u8aa4\u5dee\u304c\u3064\u304d\u307e\u3068\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u4eca\u56de\u306e\u8a08\u7b97\u306f\u8aa4\u5dee\u7121\u3057\u3067\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 (a + b\u221a5) / c -> (a, b, c) \u3068\u8868\u3059\u3053\u3068\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u3046\u3059\u308b\u3068\u3001 (a, b, c) + (d, e, f) = (af + dc, bf + ec, cf) \u3068\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u306e\u3042\u3068\u7d04\u5206\u304c\u5fc5\u8981\u3067\u3059\u3002\u4e57\u7b97\u306f\u3001 (a, b, c) * (d, e, f) = (ad + 5be, ae + bd, cf) \u9006\u6570\u306f\u3001 (a, b, c)-1 = (ac, -bc, a2 - 5b2) \u3053\u308c\u3067\u3001\u56db\u5247\u6f14\u7b97\u306f\u3067\u304d\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002 \u2026","image_url":null,"author_name":"inamori","title":"Project Euler 2\uff082\uff09","blog_title":"inamori\u2019s diary","version":"1.0","author_url":"https://blog.hatena.ne.jp/inamori/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20091108%2Fp1\" title=\"Project Euler 2\uff082\uff09 - 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>","width":"100%","url":"https://inamori.hateblo.jp/entry/20091108/p1","provider_url":"https://hatena.blog","blog_url":"https://inamori.hateblo.jp/","provider_name":"Hatena Blog","categories":["PE","\u6570\u5b66","\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0"],"height":"190","type":"rich","published":"2009-11-08 00:00:00"}