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 A173819 #5 May 13 2013 01:49:14 %S A173819 1,2,3,4,5,6,7,12,22,30,45,46,68,196,526,1431,2254,17494,17981, %T A173819 27417323062119920 %N A173819 n-th prime is a circular prime (A016114). %C A173819 Comments from _Charles R Greathouse IV_, Mar 24 2010: 223350264196231244560 <= a(21) <= 223410574802741131526, a(22) < 1.528939387 * 10^313. %Y A173819 Cf. A016114. %K A173819 nonn,base %O A173819 1,2 %A A173819 _Juri-Stepan Gerasimov_, Feb 25 2010 %E A173819 4 more terms from _R. J. Mathar_, Mar 01 2010 %E A173819 a(20) from _Charles R Greathouse IV_, Apr 22 2010