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 A142561 #11 Sep 08 2022 08:45:36
%S A142561 31,137,349,773,1091,1303,1409,1621,2999,3529,3847,4271,4483,4801,
%T A142561 5119,5437,5861,6073,6709,7027,7451,8087,9041,9677,10313,10631,10949,
%U A142561 11161,11903,12433,12539,14341,14447,15083,15401,16249,16567,16673,17203,17627,17839
%N A142561 Primes congruent to 31 mod 53.
%H A142561 Vincenzo Librandi, <a href="/A142561/b142561.txt">Table of n, a(n) for n = 1..1000</a>
%F A142561 a(n) ~ 52n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t A142561 Select[Prime[Range[2600]], MemberQ[{31}, Mod[#, 53]] &] (* _Vincenzo Librandi_, Aug 30 2012 *)
%t A142561 Select[Range[31,18000,53],PrimeQ] (* _Harvey P. Dale_, Sep 03 2012 *)
%o A142561 (Magma) [p: p in PrimesUpTo(20000) | p mod 53 eq 31]; // _Vincenzo Librandi_, Aug 30 2012
%o A142561 (PARI) is(n)=isprime(n) && n%53==31 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y A142561 Cf. A000040.
%K A142561 nonn,easy
%O A142561 1,1
%A A142561 _N. J. A. Sloane_, Jul 11 2008