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 A172386 #5 Jun 15 2013 15:01:25 %S A172386 2,983,1327373,12695039657 %N A172386 The prime which gives n primes as quickly as possible by concatenation of numbers incremented in sequence. %C A172386 This is analogous to A172257, with increments in place of decrements. %e A172386 23 comes from 2, explaining the first term. Until 983, no prime gives primes with concatenation of 5 and 7 numbers. %Y A172386 A172257 %K A172386 base,nonn %O A172386 1,1 %A A172386 _James G. Merickel_, Feb 01 2010