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 A032729 #14 Aug 13 2024 11:56:01
%S A032729 0,1,3,4,7,9,12,13,15,21,22,25,28,33,34,40,51,54,63,64,67,72,75,78,79,
%T A032729 88,90,91,96,99,103,114,117,118,126,129,138,139,147,151,153,154,157,
%U A032729 160,165,166,171,172,175,180,184,187,195,196,199,201,208,213,216
%N A032729 Numbers k such that k prefixed by '4' and followed by '9' is prime.
%H A032729 Harvey P. Dale, <a href="/A032729/b032729.txt">Table of n, a(n) for n = 1..1000</a>
%t A032729 Select[Range[0,300],PrimeQ[FromDigits[Join[{4},IntegerDigits[#],{9}]]]&] (* _Harvey P. Dale_, Jun 04 2019 *)
%Y A032729 Cf. A032702-A032733.
%K A032729 nonn,base
%O A032729 1,3
%A A032729 _Patrick De Geest_, May 15 1998