%I #11 Sep 08 2022 08:46:09
%S 3,6,8,12,12,39,24,24,36,56,24,90,40,60,56,48,48,80,56,96,54,90,48,
%T 224,120,126,68,224,60,216,104,120,121,180,84,128,124,171,120,252,84,
%U 288,120,255,168,180,120,308,162,168,168,372,108,360,128,372,138,266
%N a(n) = sigma(n + sigma(n)).
%e For n = 6; a(n) = sigma(6 + sigma(6)) = sigma(18) = 39.
%o (Magma) [SumOfDivisors(n+SumOfDivisors(n)):n in[1..1000]]
%o (PARI)
%o vector(100,n,sigma(n+sigma(n))) \\ _Derek Orr_, Sep 07 2014
%Y Cf. A000203, A246909, A246907 (numbers n such that a(n) = 3n), A246915 (numbers n such that a(n) = a(n+1)).
%Y Cf. Sequences of numbers n such that a(n) = k*sigma(n):
%Y A246857 (k=2), A246910 (k=3), A246911 (k=4), A246912 (k=5), A246913 (k=6).
%K nonn
%O 1,1
%A _Jaroslav Krizek_, Sep 07 2014