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 A142173 #9 Sep 08 2022 08:45:35
%S A142173 23,101,179,257,491,569,647,881,1193,1427,1583,1973,2129,2207,2441,
%T A142173 2753,2909,3221,3299,3533,3767,3923,4001,4079,4157,4391,4547,4703,
%U A142173 4937,5171,5483,5639,5717,6029,6263,6653,7043,7121,7433,7589,7823,7901,8291,8369
%N A142173 Primes congruent to 23 mod 39.
%H A142173 Vincenzo Librandi, <a href="/A142173/b142173.txt">Table of n, a(n) for n = 1..1000</a>
%F A142173 a(n) ~ 24n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142173 Select[Prime[Range[3000]],MemberQ[{23},Mod[#,39]]&] (* _Vincenzo Librandi_, Aug 20 2012 *)
%o A142173 (Magma) [p: p in PrimesUpTo(10000) | p mod 39 eq 23 ]; // _Vincenzo Librandi_, Aug 20 2012
%o A142173 (PARI) is(n)=isprime(n) && n%39==23 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142173 Cf. A000040.
%K A142173 nonn,easy
%O A142173 1,1
%A A142173 _N. J. A. Sloane_, Jul 11 2008