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Housemouse · 2008-05-27, 14:18

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?

2008-05-27, 14:18	#1
Housemouse Feb 2008 2⁵ Posts	Right Perfect Prime Numbers 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?