摘要： Problem Description The greatest common divisor GCD(a,b) of two positive integers a and b,sometimes written (a,b),is the largest divisor common to a a 阅读全文

摘要： Problem Description The Euler function phi is an important kind of function in number theory, (n) represents the amount of the numbers which are small 阅读全文

摘要： 题目描述 The Sky is Sprite. The Birds is Fly in the Sky. The Wind is Wonderful. Blew Throw the Trees Trees are Shaking, Leaves are Falling. Lovers Walk pa 阅读全文