[seqfan] Re: sum of prime factors of p-1 and p+1
charles.greathouse at case.edu
Mon May 16 23:17:57 CEST 2011
I suppose there are two versions, one counting multiplicity and the other
discarding it. The sequences are related to A086711.
Case Western Reserve University
On Mon, May 16, 2011 at 4:43 PM, N. J. A. Sloane <njas at research.att.com>wrote:
> Seq Fans, This just came in from a correspondent.
> Can someone please compute further terms and submit it?
> >From thekingfishb at yahoo.ca Mon May 16 13:51:01 2011
> From: JM Bergot <thekingfishb at yahoo.ca>
> Subject: A086715 & A001414
> Primes p such that that for some prime q,
> the sum of the prime factors of p-1 = q,
> and the same for p+1:
> 11, 251 and 1429.
> For 11 q is 7, for 251 it is 17, and for 1429 it is 31.
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