[seqfan] Re: sum of prime factors of p-1 and p+1

N. J. A. Sloane njas at research.att.com
Mon May 16 23:38:27 CEST 2011


But A086711 doesn't require that the sum of prime factors of p-1 and p+1
be a prime - although it IS in all the terms shown!
Is it always? If so, why? If not, there should be another sequence
(or two) with the other version and the exceptions.

Neil





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