Pseudoprime numbers

Pseudoprime numbers

时间： 1ms        内存：128M

描述：

Fermat's theorem states that for any prime number p and for any integer a > 1, a^p == a (mod p). That is, if we raise a to the pth power and divide by p, the remainder is a. Some (but not very many) non-prime values of p, known as base-a pseudoprimes, have this property for some a. (And some, known as Carmichael Numbers, are base-a pseudoprimes for all a.)

Given 2 < p ≤ 1,000,000,000 and 1 < a < p, determine whether or not p is a base-a pseudoprime.

Input contains several test cases followed by a line containing "0 0". Each test case consists of a line containing p and a. For each test case, output "yes" if p is a base-a pseudoprime; otherwise output "no".

输入：

输出：

示例输入：

3 2
10 3
341 2
341 3
1105 2
1105 3
0 0

示例输出：

no
no
yes
no
yes
yes

提示：

参考答案：

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