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 A366670 #16 Jan 06 2024 14:16:29
%S A366670 2,7,37,7,1297,7,13,7,17,7,37,7,1297,7,37,7,353,7,13,7,41,7,37,7,17,7,
%T A366670 37,7,281,7,13,7,2753,7,37,7,577,7,37,7,17,7,13,7,89,7,37,7,193,7,37,
%U A366670 7,1297,7,13,7,17,7,37,7,41,7,37,7,4926056449,7,13,7,137
%N A366670 Smallest prime dividing 6^n + 1.
%H A366670 Max Alekseyev, <a href="/A366670/b366670.txt">Table of n, a(n) for n = 0..4095</a>
%F A366670 a(n) = A020639(A062394(n)). - _Paul F. Marrero Romero_, Oct 17 2023
%t A366670 Table[FactorInteger[6^n + 1][[1,1]], {n, 0, 68}] (* _Paul F. Marrero Romero_, Oct 17 2023 *)
%Y A366670 Cf. A020639, A062394, A274904, A366630.
%Y A366670 Cf. A002586, A366609, A366671, A038371, A366719.
%K A366670 nonn
%O A366670 0,1
%A A366670 _Sean A. Irvine_, Oct 15 2023