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 A185668 #6 Jul 02 2017 12:21:22 %S A185668 271,1831,66947,3746299,66478091,66478091,57260418041 %N A185668 Final prime of first member of A019518 that is divisible by 19^n. %e A185668 The first concatenation of primes--23, 235, 2357, 235711, etc.--that is divisible by 19 concatenates through 271, and to get divisibility by 19^2 it's necessary to go through 1831. %Y A185668 Cf. A183194, A185656, and those following. %K A185668 nonn,base,more %O A185668 1,1 %A A185668 _James G. Merickel_, Feb 01 2011