{"blog_url":"https://boxnos.hatenablog.com/","type":"rich","description":"\u4e94\u89d2\u6570\u306b\u95a2\u3059\u308b\u554f\u984c\u3002 Problem 44 - PukiWiki2\u3064\u306e\u4e94\u89d2\u6570\u306e\u548c\u3068\u5dee\u3092\u53d6\u3063\u3066\u3001\u4e94\u89d2\u6570\u306b\u306a\u308b\u3082\u306e\u3092\u898b\u3064\u3051\u308b\u3002 \u4e94\u89d2\u6570\u30c1\u30a7\u30c3\u30af\u306f\u524d\u306b\u66f8\u3044\u305f\u306e\u3067\u30b3\u30d4\u30c3\u30da\u3067\u30022\u3064\u306e\u548c\u3068\u5dee\u306f\u4e94\u89d2\u6570\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6301\u3063\u3066\u304a\u3044\u3066\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3068\u6bd4\u8f03\u3057\u3066\u304f\u4e8b\u306b\u3059\u308b\u3002 (define (problem44) (letrec ((pentagonal? (lambda (n) (integer? (/ (+ (sqrt (+ 1 (* 24 n))) 1) 6)))) (iter (lambda (n acc) (let* ((p (/ (* n (- (* 3 n) 1)) 2)) (res (find (lambd\u2026","height":"190","published":"2008-05-23 02:55:49","provider_name":"Hatena Blog","width":"100%","categories":["Scheme"],"author_url":"https://blog.hatena.ne.jp/tanakaBox/","url":"https://boxnos.hatenablog.com/entry/20080523/1211478949","provider_url":"https://hatena.blog","author_name":"tanakaBox","version":"1.0","image_url":null,"title":" Problem 44 - \u4e94\u89d2\u6570","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fboxnos.hatenablog.com%2Fentry%2F20080523%2F1211478949\" title=\" Problem 44 - \u4e94\u89d2\u6570 - \u30dc\u30af\u30ce\u30b9\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"\u30dc\u30af\u30ce\u30b9"}