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 A092992 #5 Dec 05 2013 19:56:46 %S A092992 2221,31,555555555551,71,1111111111111111111,131, %T A092992 1717171717171717171717171717171,191,2323231,29292929291,311, %U A092992 3737373737373737373737371,41411,431 %N A092992 Smallest prime of the form concatenation of prime(n) with itself followed by a 1. %C A092992 Next prime, if it exists, is > 10^70. - _Sam Alexander_, Jan 09 2005 %Y A092992 Cf. A092993, A092994, A092995. %K A092992 base,nonn %O A092992 1,1 %A A092992 _Amarnath Murthy_, Mar 28 2004 %E A092992 More terms from _Sam Alexander_, Jan 09 2005