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Positions of odd terms in A007497.
2

%I #2 Mar 30 2012 17:26:35

%S 2,4,6,33

%N Positions of odd terms in A007497.

%C Corresponding odd terms 3,7,15,564210119465811 (A175878).

%t n=2;Do[If[OddQ[n=DivisorSigma[1,n]],Print[{k,n}]],{k,2,99}]

%Y A007497, A175878.

%K more,nonn

%O 1,1

%A _Zak Seidov_, Oct 07 2010

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Last modified September 23 11:10 EDT 2024. Contains 376154 sequences. (Running on oeis4.)