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 A142269 #18 Sep 08 2022 08:45:36
%S A142269 149,751,1009,1181,1439,1697,1783,2213,2557,2729,3331,3761,3847,4019,
%T A142269 4363,4621,4793,5051,5309,5653,6427,6599,6857,7459,7717,8147,8233,
%U A142269 8663,9007,9437,9781,10039,10211,11071,11243,11329,11587,12619,12791,13049,14081
%N A142269 Primes congruent to 20 mod 43.
%H A142269 Vincenzo Librandi, <a href="/A142269/b142269.txt">Table of n, a(n) for n = 1..1000</a>
%F A142269 a(n) ~ 42n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142269 Select[Prime[Range[5000]], MemberQ[{20}, Mod[#, 43]] &] (* _Vincenzo Librandi_, Aug 25 2012 *)
%t A142269 Select[Range[20,15000,43],PrimeQ] (* _Harvey P. Dale_, Jun 04 2021 *)
%o A142269 (Magma) [p: p in PrimesUpTo(16000) | p mod 43 eq 20 ]; // _Vincenzo Librandi_, Aug 25 2012
%o A142269 (PARI) is(n)=isprime(n) && n%43==20 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142269 Cf. A000040, A144562.
%K A142269 nonn,easy
%O A142269 1,1
%A A142269 _N. J. A. Sloane_, Jul 11 2008