This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A366717 #11 Oct 26 2023 08:42:44
%S A366717 11,11,11,5,11,7,11,5,11,11,11,5,11,11,11,5,11,7,11,5,11,11,11,5,11,
%T A366717 11,11,5,11,7,11,5,11,11,11,5,11,11,11,5,11,7,11,5,11,11,11,5,11,11,
%U A366717 11,5,11,7,11,5,11,11,11,5,11,11,11,5,11,7,11,5,11,11,11
%N A366717 Smallest prime dividing 12^n - 1.
%C A366717 Periodic with period 12, repeat of 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5.
%F A366717 a(n) = A020639(A024140(n)). - _Paul F. Marrero Romero_, Oct 25 2023
%t A366717 Table[FactorInteger[12^n - 1][[1,1]], {n,71}] (* _Paul F. Marrero Romero_, Oct 25 2023 *)
%Y A366717 Cf. A024140, A366718, A366719.
%K A366717 nonn
%O A366717 1,1
%A A366717 _Sean A. Irvine_, Oct 17 2023