In mathematical terms, a perfect number is a positive integer which equals the summ of its proper divisors. A detailed explanation can be found here.
The first perfect number is 6 since 6 = 1 + 2 + 3. The second is 28 where 28 = 1 + 2 + 4 + 7 + 14. Below, I have written scripts to test if a number is perfect as well as find all of the perfect numbers below a given maxiimum.