A175877 - OEIS

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A175877

Positions of odd terms in A007497.

2

2, 4, 6, 33

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..4.

MATHEMATICA

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

CROSSREFS

A007497, A175878.

Sequence in context: A056696 A045662 A195324 * A269265 A173818 A263541

Adjacent sequences: A175874 A175875 A175876 * A175878 A175879 A175880

KEYWORD

more,nonn

AUTHOR

Zak Seidov, Oct 07 2010

STATUS

approved