Introduction - If you have any usage issues, please Google them yourself
Positive integer x can be about a few of the positive integer x divisible. Some positive integer x the number recorded as the number of div (x). For example, 1,2,5,10 are about 10 positive integer number, and div (10) = 4. For a and b are two positive integers, a < = b, find a and b between the number of up to about a few of the number of x.