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A139041 Sum of divisors of the number of partitions of n. 5
1, 3, 4, 6, 8, 12, 24, 36, 72, 96, 120, 96, 102, 240, 372, 384, 480, 576, 1026, 960, 2340, 2016, 1512, 3224, 3240, 6720, 6336, 6588, 6048, 13104, 11232, 12768, 17784, 22176, 22344, 17978, 27072, 35112, 69696, 87552, 74496, 87048, 104544, 97216, 137088, 214896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = sigma(A000041(n)) = A000203(A000041(n)).

EXAMPLE

a(7)=24 because the number of partitions of 7 is 15 and the sum of divisors of 15 is equal to 1 + 3 + 5 + 15 = 24.

MATHEMATICA

DivisorSigma[1, PartitionsP[Range[50]]] (* Harvey P. Dale, Nov 27 2011 *)

PROG

(PARI) a(n) = sigma(numbpart(n)); \\ Michel Marcus, Jun 01 2015

CROSSREFS

Cf. A000041, A000203, A139055.

Sequence in context: A277099 A146566 A204658 * A244607 A136483 A240494

Adjacent sequences:  A139038 A139039 A139040 * A139042 A139043 A139044

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 16 2008

STATUS

approved

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Last modified November 26 16:41 EST 2020. Contains 338641 sequences. (Running on oeis4.)