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 A141887 #24 Sep 08 2022 08:45:35 %S A141887 19,59,79,139,179,199,239,359,379,419,439,479,499,599,619,659,719,739, %T A141887 839,859,919,1019,1039,1259,1279,1319,1399,1439,1459,1499,1559,1579, %U A141887 1619,1699,1759,1879,1979,1999,2039,2099,2179,2239,2339,2399,2459,2539,2579,2659 %N A141887 Primes congruent to 19 mod 20. %H A141887 Vincenzo Librandi, <a href="/A141887/b141887.txt">Table of n, a(n) for n = 1..1000</a> %t A141887 Select[Range[19,5000,20],PrimeQ[#]&] (* _Vladimir Joseph Stephan Orlovsky_, Mar 31 2011*) %o A141887 (Magma) [p: p in PrimesUpTo(3000) | p mod 20 eq 19 ]; // _Vincenzo Librandi_, Aug 16 2012 %o A141887 (PARI) is(n)=isprime(n) && n%20==19 \\ _Charles R Greathouse IV_, Jul 01 2016 %Y A141887 Cf. A000040, A105854, A141881, A141882, A141883. %K A141887 nonn,easy %O A141887 1,1 %A A141887 _N. J. A. Sloane_, Jul 11 2008