正整数的因子和的另一个公式

Another Formula of Positive Integers' Factor Sum

利用欧拉所推导的结论构造出求正整数因子和的另一个公式,如此可以简化正整数因子和的计算方法,并能利用公式判断正整数是否为素数。

This article constructs another formula of positive integers＇ factor sum with the conclusion deduced by Euler. By this, the method of calculating the positive integers＇ factor sum can be simplified. Furthermore, this formula can be used to judge whether a positive integer is a prime number or not.