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 A032725 #16 Mar 01 2025 18:37:28
%S A032725 0,3,4,6,7,9,12,13,15,18,22,25,27,33,37,39,43,46,49,54,58,67,69,76,78,
%T A032725 81,85,88,90,96,109,112,123,129,136,138,139,145,157,175,180,183,186,
%U A032725 195,196,199,207,210,217,222,223,229,231,234,235,237,238,246,250,255
%N A032725 Numbers k such that k prefixed by '9' and followed by '7' is prime.
%H A032725 Harvey P. Dale, <a href="/A032725/b032725.txt">Table of n, a(n) for n = 1..1000</a>
%t A032725 Select[Range[0,300],PrimeQ[FromDigits[Join[{9},IntegerDigits[#],{7}]]]&] (* _Harvey P. Dale_, Mar 01 2025 *)
%Y A032725 Cf. A032702-A032733.
%K A032725 nonn,base
%O A032725 1,2
%A A032725 _Patrick De Geest_, May 15 1998
%E A032725 Offset changed by _Andrew Howroyd_, Aug 13 2024