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 A142121 #12 Sep 08 2022 08:45:35
%S A142121 197,271,419,641,863,937,1307,1381,1973,2269,2417,2713,2861,3083,3527,
%T A142121 3823,4637,4933,5081,5303,5821,6043,6709,6857,7079,7523,8263,8707,
%U A142121 8929,9151,9521,9743,9817,10039,10631,10853,11149,11519,11593,12037,12703,13147,13591
%N A142121 Primes congruent to 12 mod 37.
%H A142121 Vincenzo Librandi, <a href="/A142121/b142121.txt">Table of n, a(n) for n = 1..1000</a>
%F A142121 a(n) ~ 36n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142121 Select[Range[12,20000,37],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, May 08 2011 *)
%t A142121 Select[Prime[Range[5000]],MemberQ[{12},Mod[#,37]]&] (* _Vincenzo Librandi_, Aug 19 2012 *)
%o A142121 (Magma)[p: p in PrimesUpTo(15000) | p mod 37 eq 12 ]; // _Vincenzo Librandi_, Aug 19 2012
%o A142121 (PARI) is(n)=isprime(n) && n%37==12 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142121 Cf. A000040, A142118, A142119, A142120.
%K A142121 nonn,easy
%O A142121 1,1
%A A142121 _N. J. A. Sloane_, Jul 11 2008