{"categories":["\u6570\u5b66"],"url":"https://all-for-nothing.com/entry/2022/07/23/212051","provider_name":"Hatena Blog","height":"190","provider_url":"https://hatena.blog","published":"2022-07-23 21:20:51","description":"\u554f\u984c \u89e3\u7b54 \u65e7\u89e3\u7b54 \u65b0\u89e3\u7b54\u3068\u306e\u7570\u540c a b c SLP & Evan Chen \u5225\u89e3 \u6b63\u4f53 \u96d1\u611f \u554f\u984c \u554f\u984c 2. $3$ \u4ee5\u4e0a\u306e\u6574\u6570 $n$ \u3067, \u6b21\u306e\u6761\u4ef6\u3092\u307f\u305f\u3059 $n+2$ \u500b\u306e\u5b9f\u6570 $a_1, a_2, \\dots, a_{n+2}$ \u304c\u5b58\u5728\u3059\u308b\u3082\u306e\u3092\u3059\u3079\u3066\u6c42\u3081\u3088. $a _ {n+1}=a _ 1$, $a _ {n+2}=a _ 2$ $i=1,2,\\dots,n$ \u306b\u5bfe\u3057\u3066, $a _ i a _ {i+1} + 1 = a _ {i+2}$ IMO 2018 \u516c\u5f0f\u65e5\u672c\u8a9e\u8a33 \u89e3\u7b54 \u65e7\u89e3\u7b54 2018 \u5e74\u306b\u6570\u5b66\u30aa\u30ea\u30f3\u30d4\u30c3\u30af\u8ca1\u56e3\u304c\u4ed8\u3057\u305f\u89e3\u7b54\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u9806\u5e8f\u4ed8\u304d\u30ea\u30b9\u30c8\u306f\u5f15\u7528\u8005\u2026","type":"rich","blog_title":"\u7a7a\u8ad6\u4e0a\u306e\u7802\u3001\u697c\u95a3\u4e0a\u306e\u673a\u3002","image_url":null,"blog_url":"https://all-for-nothing.com/","width":"100%","version":"1.0","author_name":"all_for_nothing","title":"IMO 2018-2 \u306e\u5bc6\u304b\u306a\u4fee\u6b63","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fall-for-nothing.com%2Fentry%2F2022%2F07%2F23%2F212051\" title=\"IMO 2018-2 \u306e\u5bc6\u304b\u306a\u4fee\u6b63 - \u7a7a\u8ad6\u4e0a\u306e\u7802\u3001\u697c\u95a3\u4e0a\u306e\u673a\u3002\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_url":"https://blog.hatena.ne.jp/all_for_nothing/"}