Chapter 6, Problem 23P

A perfect number is a positive integer that is equal to the sum of its positive divisors except the number itself. The first two perfect numbers are 6 and 28 since $\text{6}=\text{1}+\text{2}+\text{3}$ and $\text{28}=\text{1}+\text{2}+\text{4}+\text{7}+\text{14}$ . Write a computer program that finds the first four perfect numbers.