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Definition: Perfect numbers are numbers that whose sum of its divisors (excluding itself) equals the number itself.
A neat example would be :
The next perfect numbers are . There are known perfect numbers as of January . Euclid proved a formation rule whereby is an even perfect number whenever is a Mersenne Prime (of the form: ). The formula for an even perfect number is where and are prime. It is not known whether there are any odd perfect numbers, nor whether infinitely many perfect numbers exist.
There are other variations of perfect numbers like Triperfect numbers, Quasiperfect numbers and many more! Sadly, the list of these variations have an ending and no ore of these have been found.
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