{"blog_title":"\u3084\u306d\u3046\u3089\u304a\u30d6\u30ed\u30b0(\u79fb\u8ee2\u3057\u307e\u3057\u305f)","provider_name":"Hatena Blog","height":"190","author_url":"https://blog.hatena.ne.jp/yaneurao/","version":"1.0","published":"2009-12-23 00:00:00","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fyaneurao.hatenadiary.com%2Fentry%2F20091223%2Fp1\" title=\" \u7406\u89e3\u3059\u308b\u3063\u3066\u3069\u3046\u3044\u3046\u3053\u3068\u3060\u308d\u3046\uff1f - \u3084\u306d\u3046\u3089\u304a\u30d6\u30ed\u30b0(\u79fb\u8ee2\u3057\u307e\u3057\u305f)\" 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%","title":" \u7406\u89e3\u3059\u308b\u3063\u3066\u3069\u3046\u3044\u3046\u3053\u3068\u3060\u308d\u3046\uff1f","provider_url":"https://hatena.blog","type":"rich","url":"https://yaneurao.hatenadiary.com/entry/20091223/p1","categories":["think"],"blog_url":"https://yaneurao.hatenadiary.com/","description":"\u300c1,3,5,\u2026\u3068\u5947\u6570\u306e\u548c\u3092\u3069\u3053\u304b\u3067\u4e2d\u65ad\u3059\u308b\u5834\u5408\u3092\u8003\u3048\u308b\u3002\u4f8b\u3048\u3070\u30011 + 3 = 4 , 1 + 3 + 5 = 9 , 1 + 3 + 5 + 7 = 16 , \u2026\u3002\u4e0d\u601d\u8b70\u306a\u3053\u3068\u306b\u3001\u305d\u308c\u3089\u306f\u3044\u3064\u3082\u5e73\u65b9\u6570(\u81ea\u7136\u6570\u306e2\u4e57)\u306b\u306a\u3063\u3066\u3044\u308b\u3002\u300d \u2191\u3092\u8a3c\u660e\u305b\u3088\u3068\u3044\u3046\u306e\u304c\u3001\u9ad8\u6821\u6570\u5b66\u3067\u03a3\u306e\u8a08\u7b97\u3092\u5b66\u3093\u3060\u3068\u304d\u306b\u66f8\u3044\u3066\u3042\u3063\u305f\u3068\u601d\u3046\u3002 \u25a0 \u7406\u89e3\u306e\u30b9\u30c6\u30c3\u30d71) \u03a3\u306e\u8a08\u7b97 \u3088\u304f\u306f\u899a\u3048\u3066\u3044\u306a\u3044\u304c\u3001\u89e3\u7b54\u306f\u305f\u3076\u3093\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u3060\u3063\u305f\u3068\u601d\u3046\u3002\u306a\u304a\u3001\u4ee5\u4e0b\u306e\"^\" \u306f\u3079\u304d\u4e57\u3092\u610f\u5473\u3059\u308b\u3068\u3059\u308b\u3002 S(n) = 1 + 2 + \u2026 + n = n(n+1)/2 \u5168\u4f53\u30922\u500d\u3057\u3066 2S(n) = 2 + 4 + \u2026 + 2n = n(n+1\u2026","image_url":null,"author_name":"yaneurao"}