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 A032674 #6 Mar 09 2015 09:35:19 %S A032674 1,5,11,19,23,31,35,37,41,59,61,67,73,83,85,89,97,113,115,121,125,127, %T A032674 133,163,173,187,209,211,215,217,221,239,251,253,257,271,277,281,283, %U A032674 301,311,317,323,335,343,355,365,379,395,403,407,409,415 %N A032674 Digit '2' concatenated with a(n) is a lucky number. %Y A032674 Cf. A000959. %K A032674 nonn,base,less %O A032674 1,2 %A A032674 _Patrick De Geest_, May 15 1998