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 A141891 #20 Sep 08 2022 08:45:35 %S A141891 29,71,113,197,239,281,449,491,617,659,701,743,827,911,953,1163,1289, %T A141891 1373,1499,1583,1667,1709,1877,2003,2087,2129,2213,2297,2339,2381, %U A141891 2423,2549,2591,2633,2801,2843,2927,2969,3011,3137,3221,3347,3389,3557,3767,3851 %N A141891 Primes congruent to 8 mod 21. %H A141891 Vincenzo Librandi, <a href="/A141891/b141891.txt">Table of n, a(n) for n = 1..1000</a> %F A141891 a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 03 2016 %t A141891 Select[Range[8,5000,21],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 04 2011 *) %o A141891 (Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 8 ]; // _Vincenzo Librandi_, Apr 05 2011 %o A141891 (PARI) is(n)=isprime(n) && n%21==8 \\ _Charles R Greathouse IV_, Jul 03 2016 %Y A141891 Cf. A000040, A124826. %K A141891 nonn,easy %O A141891 1,1 %A A141891 _N. J. A. Sloane_, Jul 11 2008