Untersee-boot XXI

首先介绍一个相关的引理。和总是得到1，称这两个数为1的“平凡平方根”。当p是素数且p>2时，不存在的“非平凡平方根”。为了证明该引理，我们假设x是的平方根，于是有[1]推出p|(x+1)(x-1)，也就是说，p|x+1或p|x-1。现在假设n是一个奇素数，且 n>2。于是n-1是一个偶数，可以被表示为...

Farmer John keeps a website called ‘FansBlog’ .Everyday , there are many people visited this blog.One day, he find the visits has reached P , which is a prime number.He thinks it is a interesting fact...

题目描述In FZU ACM team, BroterJ and Silchen are good friends, and they often play some interesting games.在福建大学ACM队伍里，J大哥和SilchenS是好朋友，他们经常一块玩有趣的游戏。One day they play a game about GCD and LCM. firstly...