A perfect number is also well known as an integer number. This means that an integer number can only be a complete one without a fraction. So a perfect number could be a 3 or a 3234
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Mersenne primes are prime numbers that are formed by raising 2 to a power k and subtracting 1; in equation form that would be m = (2^k) 1. Multiplying the Mersenne prime (2^k) 1
http://www.ehow.com/facts_6874237_calculateperfec...

There are actually dozens of known perfect numbers, and probably more. Only four were known to the ancient Greeks, who invented the concept. The definition of a perfect number is
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4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400. Hope it helps message me on my message board if it did :
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