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 A142433 #11 Sep 08 2022 08:45:36
%S A142433 23,317,709,1297,1493,1787,2081,2179,2473,2767,2963,3061,3257,3943,
%T A142433 4139,5021,5119,5413,5903,6197,6491,6883,7079,7177,8059,8353,8647,
%U A142433 8941,9137,9431,10313,10607,11489,11587,11783,12763,12959,13841,14723,14821,15017
%N A142433 Primes congruent to 23 mod 49.
%H A142433 Vincenzo Librandi, <a href="/A142433/b142433.txt">Table of n, a(n) for n = 1..1000</a>
%F A142433 a(n) ~ 42n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142433 Select[Prime[Range[2500]], MemberQ[{23}, Mod[#,49]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)
%t A142433 Select[Range[23,16000,49],PrimeQ] (* _Harvey P. Dale_, Sep 13 2018 *)
%o A142433 (Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 23]; // _Vincenzo Librandi_; Aug 28 2012
%o A142433 (PARI) is(n)=isprime(n) && n%49==23 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142433 Cf. A000040.
%K A142433 nonn,easy
%O A142433 1,1
%A A142433 _N. J. A. Sloane_, Jul 11 2008