2008-05-27, 15:45
|
#3
|
"Robert Gerbicz"
Oct 2005
Hungary
101101000102 Posts
|
Quote:
Originally Posted by Housemouse
If P is an even perfect number greater than 6, P-1 is always composite divisible by nine. Is it known which perfect numbers are prime for P+1?
|
http://www.research.att.com/~njas/sequences/A061644
|
|
|