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 A141896 #20 Sep 08 2022 08:45:35 %S A141896 17,59,101,227,269,311,353,479,521,563,647,773,857,941,983,1109,1151, %T A141896 1193,1277,1319,1361,1487,1571,1613,1697,1823,1907,1949,2243,2411, %U A141896 2579,2621,2663,2789,2957,2999,3041,3083,3167,3209,3251,3461,3671,3797,3881,3923 %N A141896 Primes congruent to 17 mod 21. %H A141896 Vincenzo Librandi, <a href="/A141896/b141896.txt">Table of n, a(n) for n = 1..1000</a> %F A141896 a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 03 2016 %t A141896 Select[Range[17,5000,21],PrimeQ] (* _Vladimir Joseph Stephan Orlovsky_, Apr 04 2011 *) %o A141896 (Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 17 ]; // _Vincenzo Librandi_, Apr 05 2011 %o A141896 (PARI) is(n)=isprime(n) && n%21==17 \\ _Charles R Greathouse IV_, Jul 03 2016 %Y A141896 Cf. A000040, A124826. %K A141896 nonn,easy %O A141896 1,1 %A A141896 _N. J. A. Sloane_, Jul 11 2008