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 A141870 #12 Sep 08 2022 08:45:35 %S A141870 23,61,137,251,479,593,631,821,859,1049,1087,1163,1201,1277,1429,1543, %T A141870 1619,1657,1733,1847,1999,2113,2341,2417,2531,2683,2797,3253,3329, %U A141870 3557,3671,3709,3823,4013,4051,4127,4241,4507,4583,4621,5039,5077,5153,5381,5419 %N A141870 Primes congruent to 4 mod 19. %H A141870 Vincenzo Librandi, <a href="/A141870/b141870.txt">Table of n, a(n) for n = 1..1000</a> %F A141870 a(n) ~ 18n log n. - _Charles R Greathouse IV_, Jul 03 2016 %t A141870 Select[Range[4,5000,19],PrimeQ[#]&] (* _Vladimir Joseph Stephan Orlovsky_, Mar 31 2011*) %o A141870 (Magma) [p: p in PrimesUpTo(8000) | p mod 19 eq 4 ]; // _Vincenzo Librandi_, Aug 15 2012 %o A141870 (PARI) is(n)=isprime(n) && n%19==4 \\ _Charles R Greathouse IV_, Jul 03 2016 %Y A141870 Cf. A105854, A141881, A141882, A141883. %K A141870 nonn,easy %O A141870 1,1 %A A141870 _N. J. A. Sloane_, Jul 11 2008