some simple but time wasting math logic

一些不难但麻烦（适合用电脑作）的数学函数的源码

1.Test for Prime numbers

2.Find the factorial of a number

3.Find the triangle(total sum) of a number

4.Reverse every integer of a number

5.Find any power of any value

6.Find the greatest common factor of 2 -some simple but time wasting some math logic difficult but trouble (suitable for use as computer) mathematical function source 1.Test for Prime number 's 2.Find the factorial of a number 3.Find the tri angle (total sum) of a number in every 4.Reverse teger of a number 5.Find any power of any value 6. Find the greatest common factor of two