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 A032730 #14 Aug 13 2024 11:13:12
%S A032730 0,6,9,11,17,18,20,27,30,39,41,44,47,51,56,63,65,66,68,74,77,83,84,86,
%T A032730 87,93,105,110,116,119,122,123,132,134,141,143,144,147,153,159,165,
%U A032730 167,171,174,176,182,183,185,186,189,192,194,200,206,218,224,225
%N A032730 Numbers k such that k prefixed by '5' and followed by '9' is prime.
%t A032730 Select[Range[0,250],PrimeQ[FromDigits[Join[{5},IntegerDigits[#], {9}]]]&] (* _Harvey P. Dale_, May 09 2011 *)
%Y A032730 Cf. A032702-A032733.
%K A032730 nonn,base
%O A032730 1,2
%A A032730 _Patrick De Geest_, May 15 1998
%E A032730 Offset changed by _Andrew Howroyd_, Aug 13 2024