List of perfect numbers
The following is a list of the known perfect numbers, including the Mersenne prime exponent p which generates them with the expression 2× (2 − 1) where 2 − 1 is a Mersenne prime. All even perfect numbers are of this form. It is not known whether there are any odd perfect numbers. As of 2011 there are 47 known perfect numbers in total.
See also
References
External links
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