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 A032669 #8 Sep 03 2017 03:21:11 %S A032669 1,7,13,17,19,31,41,43,47,53,59,61,73,77,83,91,101,113,121,131,133, %T A032669 143,151,163,173,197,199,203,211,217,221,229,247,257,263,269,271,277, %U A032669 287,299,301,311,317,323,329,337,343,353,359,361,367,373,379 %N A032669 Digit '6' concatenated with n is a prime. %H A032669 Seiichi Manyama, <a href="/A032669/b032669.txt">Table of n, a(n) for n = 1..10000</a> %K A032669 nonn,base %O A032669 1,2 %A A032669 _Patrick De Geest_, May 15 1998