本文共 861 字,大约阅读时间需要 2 分钟。
(define (Ramanujan s) (define (stream-cadr s) (stream-car (stream-cdr s))) (define (stream-cddr s) (stream-cdr (stream-cdr s))) (let ((scar (stream-car s)) (scadr (stream-cadr s))) (if (= (sum-triple scar) (sum-triple scadr)) (cons-stream (list (sum-triple scar) scar scadr) (Ramanujan (stream-cddr s))) (Ramanujan (stream-cdr s)))))(define (triple x) (* x x x))(define (sum-triple x) (+ (triple (car x)) (triple (cadr x))))(define Ramanujan-numbers (Ramanujan (weighted-pairs integers integers sum-triple)))
所以接下来的5个数是:
(4104 (2 16) (9 15)) (13832 (2 24) (18 20)) (20683 (10 27) (19 24)) (32832 (4 32) (18 30)) (39312 (2 34) (15 33))感谢您的访问,希望对您有所帮助。 欢迎大家关注或收藏、评论或点赞。
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