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 A105854 #16 Sep 08 2022 08:45:17 %S A105854 3,23,43,83,103,163,223,263,283,383,443,463,503,523,563,643,683,743, %T A105854 823,863,883,983,1063,1103,1123,1163,1223,1283,1303,1423,1483,1523, %U A105854 1543,1583,1663,1723,1783,1823,2003,2063,2083,2143,2203,2243,2383,2423,2503,2543 %N A105854 Primes of the form 20*k + 3. %C A105854 Cf. A030431: Primes of the form 10*k + 3. %H A105854 Vincenzo Librandi, <a href="/A105854/b105854.txt">Table of n, a(n) for n = 1..1000</a> %t A105854 Select[Range[3, 2003, 20], PrimeQ[ # ]&] %o A105854 (Magma) [n: n in PrimesUpTo(2600) | IsDivisibleBy(n-3,20)]; // _Bruno Berselli_, Apr 05 2011 %o A105854 (Magma) [ a: n in [0..250] | IsPrime(a) where a is 20*n+3 ]; // _Vincenzo Librandi_, Apr 06 2011 %Y A105854 Cf. A000040, A030431. %K A105854 nonn,easy %O A105854 1,1 %A A105854 _Zak Seidov_, May 05 2005 %E A105854 More terms from _N. J. A. Sloane_, Jul 11 2008