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 A141888 #15 Sep 08 2022 08:45:35 %S A141888 2,23,107,149,191,233,317,359,401,443,569,653,821,863,947,1031,1283, %T A141888 1367,1409,1451,1493,1619,1787,1871,1913,1997,2039,2081,2207,2333, %U A141888 2417,2459,2543,2711,2753,2837,2879,2963,3089,3257,3299,3467,3593,3677,3719,3761 %N A141888 Primes congruent to 2 mod 21. %H A141888 Vincenzo Librandi, <a href="/A141888/b141888.txt">Table of n, a(n) for n = 1..1000</a> %F A141888 a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 02 2016 %t A141888 Select[Prime[Range[600]], Mod[#,21] == 2&] (* _Harvey P. Dale_, Jan 04 2011 *) %o A141888 (Magma) [p: p in PrimesUpTo(4000) | p mod 21 eq 2 ]; // _Vincenzo Librandi_, Aug 16 2012 %o A141888 (PARI) is(n)=isprime(n) && n%21==2 \\ _Charles R Greathouse IV_, Jul 02 2016 %Y A141888 Cf. A000040. %K A141888 nonn,easy %O A141888 1,1 %A A141888 _N. J. A. Sloane_, Jul 11 2008