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:
Right Perfect Prime Numbers
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2008-05-30, 00:30
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9
ATH
Einyen
Dec 2003
Denmark
37×83 Posts
Question solved.
I found a factor of 2
^{p-1}
*(2
^{p}
-1) + 1 for p=132049 with gmp-ecm:
194528547122653
So of the 44 known perfect numbers P=2
^{p-1}
*(2
^{p}
-1), P+1 is only prime for p=2,3,13 and 19.
Last fiddled with by ATH on 2008-05-30 at
00:31
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