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Posted by Sempr at 2006-07-11 09:07:29 on Problem 1845
In Reply To:这题与9901是不是素数有什么关系， Posted by:xiangsanzi at 2006-07-11 00:49:51 
> 我的思路是1－a^(n+1)/1-a，因为这个式子肯定能除尽，所以当分子大于（1-a）*9901就可忽略，
> 请问各位大大用的是什么方法
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