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A152678 Even members of A000203. 5
4, 6, 12, 8, 18, 12, 28, 14, 24, 24, 18, 20, 42, 32, 36, 24, 60, 42, 40, 56, 30, 72, 32, 48, 54, 48, 38, 60, 56, 90, 42, 96, 44, 84, 78, 72, 48, 124, 72, 98, 54, 120, 72, 120, 80, 90, 60, 168, 62, 96, 104, 84, 144, 68, 126, 96, 144 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = sigma(A028983(n)) = A000203(A028983(n)). [From Jaroslav Krizek, Oct 06 2009]

LINKS

Table of n, a(n) for n=1..57.

MATHEMATICA

Select[DivisorSigma[1, Range[100]], EvenQ] (* Harvey P. Dale, Jun 18 2017 *)

CROSSREFS

Cf. A000203, A152677, A152679.

Sequence in context: A274298 A270835 A272063 * A110758 A189765 A074162

Adjacent sequences:  A152675 A152676 A152677 * A152679 A152680 A152681

KEYWORD

easy,nonn

AUTHOR

Omar E. Pol, Dec 10 2008

STATUS

approved

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Last modified August 6 00:46 EDT 2021. Contains 346493 sequences. (Running on oeis4.)