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 A032702 #12 Aug 13 2024 11:48:08 %S A032702 1,4,5,7,8,11,13,14,16,22,25,28,31,34,35,37,38,41,44,52,53,55,59,62, %T A032702 67,71,73,74,79,80,85,86,97,100,101,103,106,110,112,119,121,122,134, %U A032702 139,140,148,149,152,160,161,166,170,175,182,184,185,187,188,191,196 %N A032702 Numbers k such that k prefixed by '2' and followed by '1' is prime. %Y A032702 Cf. A032703-A032733. %Y A032702 Cf. A032682, A032683, A032684, A032685. %K A032702 nonn,base %O A032702 1,2 %A A032702 _Patrick De Geest_, May 15 1998 %E A032702 Offset changed by _Andrew Howroyd_, Aug 11 2024