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 A142217 #15 Sep 08 2022 08:45:36
%S A142217 61,307,389,881,1291,1373,1619,1783,2029,2111,2357,2521,2767,3259,
%T A142217 3833,4079,4243,4817,5227,5309,5801,6047,6211,6703,6949,7523,7687,
%U A142217 7933,8179,8753,8999,9491,9901,10639,11131,11213,12197,12689,12853,13099,13591,14083
%N A142217 Primes congruent to 20 mod 41.
%H A142217 Vincenzo Librandi, <a href="/A142217/b142217.txt">Table of n, a(n) for n = 1..1000</a>
%F A142217 a(n) ~ 40n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A142217 Select[Range[20,30000,41],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Jun 03 2011 *)
%t A142217 Select[Prime[Range[5000]],MemberQ[{20},Mod[#,41]]&] (* _Vincenzo Librandi_, Aug 23 2012 *)
%o A142217 (Magma) [p: p in PrimesUpTo(16000) | p mod 41 eq 20 ]; // _Vincenzo Librandi_, Aug 23 2012
%o A142217 (PARI) is(n)=isprime(n) && n%41==20 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A142217 Cf. A000040, A142216.
%K A142217 nonn,easy
%O A142217 1,1
%A A142217 _N. J. A. Sloane_, Jul 11 2008