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 A142939 #10 Sep 08 2022 08:45:37
%S A142939 31,223,479,607,863,991,1439,1567,1759,1823,1951,2143,2207,2399,2591,
%T A142939 2719,3167,3359,4127,4447,4639,4703,4831,5023,5087,5279,5407,5471,
%U A142939 5791,6047,6367,7583,8287,8543,8863,9311,9439,9631,9887,10079,10271,10399,10463,10847
%N A142939 Primes congruent to 31 mod 64.
%H A142939 Vincenzo Librandi, <a href="/A142939/b142939.txt">Table of n, a(n) for n = 1..1000</a>
%t A142939 Select[Prime[Range[1700]], MemberQ[{31}, Mod[#, 64]] &] (* _Vincenzo Librandi_, Sep 07 2012 *)
%o A142939 (Magma) [p: p in PrimesUpTo(11000) | p mod 64 eq 31 ]; // _Vincenzo Librandi_, Sep 07 2012
%Y A142939 Cf. A000040.
%K A142939 nonn,easy
%O A142939 1,1
%A A142939 _N. J. A. Sloane_, Jul 11 2008