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 A142650 #14 Sep 08 2022 08:45:37
%S A142650 23,79,191,359,751,863,919,1031,1087,1367,1423,1759,1871,2039,2207,
%T A142650 2543,2711,2767,2879,3271,3607,3719,3943,4111,4391,4447,4783,4951,
%U A142650 5119,5231,5399,5623,5791,5903,6911,6967,7079,7247,7583,7639,7919,8087,8311,8423
%N A142650 Primes congruent to 23 mod 56.
%H A142650 Vincenzo Librandi, <a href="/A142650/b142650.txt">Table of n, a(n) for n = 1..1000</a>
%F A142650 a(n) ~ 24n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t A142650 Select[Prime[Range[1100]],Mod[#,56]==23&] (* _Harvey P. Dale_, Jul 14 2011 *)
%t A142650 Select[Prime[Range[1300]], MemberQ[{23}, Mod[#, 56]] &] (* _Vincenzo Librandi_, Sep 01 2012 *)
%t A142650 Select[Range[23,8500,56],PrimeQ] (* _Harvey P. Dale_, Apr 13 2020 *)
%o A142650 (Magma) [p: p in PrimesUpTo(10000) | p mod 56 eq 23 ]; // _Vincenzo Librandi_, Sep 01 2012
%o A142650 (PARI) is(n)=isprime(n) && n%56==23 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y A142650 Cf. A000040.
%K A142650 nonn,easy
%O A142650 1,1
%A A142650 _N. J. A. Sloane_, Jul 11 2008