pefect numbers

N. J. A. Sloane njas at
Sat Jun 3 17:19:05 CEST 2000

to reply to a recent posting:  it is believed that there are
no odd prefect numbers.  it is known that all even perfect numbers
are of the form 2^n(2^(n+1)-1) where 2^(n+1)-1 is prime [Hardy and Wright p 239]

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