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 A032671 #9 Sep 03 2017 08:34:40 %S A032671 3,9,11,21,23,27,29,39,53,57,59,63,77,81,83,87,101,111,117,123,147, %T A032671 161,167,171,179,191,209,219,221,231,233,237,243,263,269,273,287,291, %U A032671 293,297,311,317,329,353,363,369,377,387,389,419,423,429,431,443,447 %N A032671 Digit '8' concatenated with a(n) is a prime. %H A032671 Seiichi Manyama, <a href="/A032671/b032671.txt">Table of n, a(n) for n = 1..10000</a> %K A032671 nonn,base %O A032671 1,1 %A A032671 _Patrick De Geest_, May 15 1998