OFFSET
1,2
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..10000
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