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 A142490 #9 Sep 08 2022 08:45:36
%S A142490 23,227,431,839,941,1451,1553,2063,2267,2777,2879,3083,3389,3491,3593,
%T A142490 3797,4001,4409,4817,4919,5021,5531,5939,6143,6449,6551,6653,6857,
%U A142490 6959,7673,7877,8081,8387,8693,8999,9203,10223,10427,10529,10631,10733,10937,11243
%N A142490 Primes congruent to 23 mod 51.
%H A142490 Vincenzo Librandi, <a href="/A142490/b142490.txt">Table of n, a(n) for n = 1..1000</a>
%F A142490 a(n) ~ 32n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t A142490 Select[Prime[Range[2400]], MemberQ[{23}, Mod[#, 51]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)
%o A142490 (Magma) [p: p in PrimesUpTo(13000) | p mod 51 eq 23]; // _Vincenzo Librandi_, Aug 28 2012
%o A142490 (PARI) is(n)=isprime(n) && n%51==23 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y A142490 Cf. A000040.
%K A142490 nonn,easy
%O A142490 1,1
%A A142490 _N. J. A. Sloane_, Jul 11 2008