In number theory, a perfect number is a number where all of the factors (except the number itself) add up to that number. For example, 28 has factors of 1, 2, 4, 7, and 14 (not including 28 itself) and 1+2+4+7+14=28. Thus, 28 is a perfect number. Currently, no odd perfect numbers have been discovered. Also, every even perfect number corresponds to a Mersenne Prime. These can also be called 2 Multiperfect Numbers, as if you include the number itself when adding, it equals 2 times the original numbers.
Here is a list of the first 6 perfect numbers:
- 6
- 28
- 496
- 8,128
- 33,550,336 (33.5 million)
- 8,589,869,056 (8.5 billion)
If you want more listed, you do it.