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 A157341 #13 Sep 08 2022 08:45:41
%S A157341 1,2,2,10,2,2,3,20,22,2,3,220,9,8,30,120,2,7,3,45,4,3,10,125,8,3,4,5,
%T A157341 77,108,8,30,2,3,35,15,2,35,53,10,32,2,32,50,37,12,17,215,73,45,4,55,
%U A157341 43,2,3,715,42,70,33,160,3,90,2,745,5,38,3,40,7,295,4,5,10,70,2,90,138,32,60
%N A157341 Least number k such that 6*k^n-1 is prime, with k>1 when n>1.
%H A157341 Marius A. Burtea, <a href="/A157341/b157341.txt">Table of n, a(n) for n = 1..230</a>
%o A157341 (PARI) a(n) = {my(k); if (n>1, k = 2, k = 1); while (!isprime(6*k^n-1), k++); k;} \\ _Michel Marcus_, Sep 15 2019
%o A157341 (Magma) sol:=[1]; for n in [2..80] do k:=2; while not IsPrime(6*k^n-1) do k:=k+1; end while; Append(~sol,k); end for; sol; // _Marius A. Burtea_, Sep 15 2019
%Y A157341 Cf. A164523 (where a(n)=2).
%K A157341 nonn
%O A157341 1,2
%A A157341 _Pierre CAMI_, Feb 27 2009
%E A157341 Corrected by _Pierre CAMI_, Mar 09 2009
%E A157341 Name clarified by _Michel Marcus_, Sep 15 2019