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A139041
Sum of divisors of the number of partitions of n.
6
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
OFFSET
1,2
LINKS
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
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 16 2008
STATUS
approved