A366782 - OEIS

%I #10 Oct 23 2023 05:22:21

%S 1,1,2,3,2,2,8,6,5,2,4,24,6,8,21,16,3,8,16,12,8,12,8,6,12,12,8,80,12,

%T 24,168,20,16,12,144,24,32,16,128,12,4,16,4,32,32,16,96,320,4,48,72,

%U 216,8,32,256,48,4,8,32,48,384,32,96,576,12,4,16,36,8,8

%N Number of divisors of A000073(n) (tribonacci numbers).

%H Amiram Eldar, <a href="/A366782/b366782.txt">Table of n, a(n) for n = 2..365</a>

%F a(n) = A000005(A000073(n)).

%e a(8)=8 because the 8th tribonacci number 24 has divisors {1, 2, 3, 4, 6, 8, 12, 24}.

%t DivisorSigma[0, LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 70]] (* _Amiram Eldar_, Oct 23 2023 *)

%Y Cf. A000005, A000073, A366780, A366781, A366783, A063375.

%K nonn

%O 2,3

%A _Sean A. Irvine_, Oct 22 2023