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 A141893 #20 Sep 08 2022 08:45:35 %S A141893 11,53,137,179,263,347,389,431,557,599,641,683,809,977,1019,1061,1103, %T A141893 1187,1229,1439,1481,1523,1607,1733,1901,2027,2069,2111,2153,2237, %U A141893 2447,2531,2657,2699,2741,2909,3119,3203,3329,3371,3413,3539,3581,3623,3833,3917 %N A141893 Primes congruent to 11 mod 21. %H A141893 Vincenzo Librandi, <a href="/A141893/b141893.txt">Table of n, a(n) for n = 1..1000</a> %F A141893 a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 02 2016 %t A141893 Select[Range[11,5000,21],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 04 2011 *) %o A141893 (Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 11 ]; // _Vincenzo Librandi_, Apr 05 2011 %o A141893 (PARI) is(n)=isprime(n) && n%21==11 \\ _Charles R Greathouse IV_, Jul 02 2016 %Y A141893 Cf. A000040, A124826. %K A141893 nonn,easy %O A141893 1,1 %A A141893 _N. J. A. Sloane_, Jul 11 2008