[seqfan] Re: A006521 and n dividing 2^n+1, but not 2^(n-1)+1
maxale at gmail.com
Tue Feb 23 03:36:07 CET 2010
On Mon, Feb 22, 2010 at 5:29 PM, Rainer Rosenthal <r.rosenthal at web.de> wrote:
> In a discussion in de.rec.denksport I learned that
> no n > 1 does exist such that (2)
> n divides 2^(n-1)+1.
> I couldn't find any sequence related to this fact. I would like to
> see a proof for (2).
My proof is given in http://www.research.att.com/~njas/sequences/A006517
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