[seqfan] A002961: sigma(n)=sigma(n+1).

zak seidov zakseidov at yahoo.com
Tue Jan 5 20:02:19 CET 2010

Subj: A002961 No n's == 0 or 5 (mod 6). 

Dear seqfans,

Can/wish anybody prove/disprove that, in A002961, there are no terms of forms 6*k or 6*k+5,
or find counterexamples 
(such n's if any should be ~> 3*10^10).

Thanks, Zak


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