When 49 is divide by a certain number,the remainder is 1.List all the possible values of

题目

When 49 is divide by a certain number,the remainder is 1.List all the possible values of
the number除了一个个列出来有什么快一点的方法?

答案

2,3,4,6,8,12,16,24
其实就是看48 （49-1）可以被 哪些数整除吧.