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 A366719 #11 Jan 04 2024 15:37:51
%S A366719 2,13,5,7,89,13,5,13,17,7,5,13,89,13,5,7,153953,13,5,13,41,7,5,13,17,
%T A366719 13,5,7,89,13,5,13,769,7,5,13,89,13,5,7,17,13,5,13,89,7,5,13,7489,13,
%U A366719 5,7,89,13,5,13,17,7,5,13,41,13,5,7,36097,13,5,13,89,7
%N A366719 Smallest prime dividing 12^n + 1.
%H A366719 Max Alekseyev, <a href="/A366719/b366719.txt">Table of n, a(n) for n = 0..511</a>
%F A366719 a(n) = A020639(A178248(n)). - _Paul F. Marrero Romero_, Oct 25 2023
%t A366719 Table[FactorInteger[12^n + 1][[1,1]], {n, 0, 69}] (* _Paul F. Marrero Romero_, Oct 25 2023 *)
%Y A366719 Cf. A002586, A038371, A178248, A366712, A366713, A366714, A366715, A366716, A366717, A366720.
%K A366719 nonn
%O A366719 0,1
%A A366719 _Sean A. Irvine_, Oct 17 2023