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Sum of the divisors of 11^n+1.
12

%I #7 Jan 04 2024 17:08:21

%S 3,28,186,3458,21966,375816,2911272,45470096,340452396,6278429920,

%T 39543942612,706019328000,4708961513592,82162955169792,

%U 599236951715280,11195197038864384,68925937595777100,1179397832668228992,9136813499663186064,144079834776308121600

%N Sum of the divisors of 11^n+1.

%H Max Alekseyev, <a href="/A366689/b366689.txt">Table of n, a(n) for n = 0..325</a>

%F a(n) = sigma(11^n+1) = A000203(A034524(n)).

%e a(4)=21966 because 11^4+1 has divisors {1, 2, 7321, 14642}.

%p a:=n->numtheory[sigma](11^n+1):

%p seq(a(n), n=0..100);

%Y Cf. A034524, A000203, A366666, A366684, A366686, A366687, A366688, A366690, A366715.

%K nonn

%O 0,1

%A _Sean A. Irvine_, Oct 16 2023