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Sum of the divisors of A001045(n) (Jacobsthal numbers).
2

%I #10 Feb 25 2024 02:17:28

%S 1,1,4,6,12,32,44,108,260,384,684,2688,2732,5632,15936,27864,43692,

%T 153920,174764,499968,953920,1477440,2796204,11708928,12253248,

%U 22380544,69769600,115568640,181990200,620101632,715827884,1826150832,3880589184,5726797824

%N Sum of the divisors of A001045(n) (Jacobsthal numbers).

%H Amiram Eldar, <a href="/A366772/b366772.txt">Table of n, a(n) for n = 1..1122</a>

%F a(n) = sigma(Jacobsthal(n)) = A000203(A001045(n)).

%e a(9) = 260 because Jacobsthal(9) = 171 has divisors {1, 3, 9, 19, 57, 171}.

%Y Cf. A000203, A001045, A366769, A366770, A366771, A063477.

%K nonn

%O 1,3

%A _Sean A. Irvine_, Oct 21 2023