The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A139041 Sum of divisors of the number of partitions of n. 5

%I

%S 1,3,4,6,8,12,24,36,72,96,120,96,102,240,372,384,480,576,1026,960,

%T 2340,2016,1512,3224,3240,6720,6336,6588,6048,13104,11232,12768,17784,

%U 22176,22344,17978,27072,35112,69696,87552,74496,87048,104544,97216,137088,214896

%N Sum of divisors of the number of partitions of n.

%H Giovanni Resta, <a href="/A139041/b139041.txt">Table of n, a(n) for n = 1..10000</a>

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

%e 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.

%t DivisorSigma[1,PartitionsP[Range[50]]] (* _Harvey P. Dale_, Nov 27 2011 *)

%o (PARI) a(n) = sigma(numbpart(n)); \\ _Michel Marcus_, Jun 01 2015

%Y Cf. A000041, A000203, A139055.

%K nonn

%O 1,2

%A _Omar E. Pol_, Apr 16 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 21 06:14 EST 2021. Contains 340333 sequences. (Running on oeis4.)