2012年12月26日
Problem 21
摘要： Amicable numbersProblem 2105 July 2002Let d(n) be defined as the sum of proper divisors ofn(numbers less thannwhich divide evenly inton).If d(a) =band d(b) =a, whereab, thenaandbare an amicable pair and each ofaandbare called amicable numbers.For example, the proper divisors of 220 are 1, 2, 4, 5, 1 阅读全文
posted @ 2012-12-26 10:43 黄牛 阅读(103) 评论(0) 推荐(0)