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 A252016 #20 Jan 01 2015 20:11:59 %S A252016 2,23,223,2322337,223232233717,232233722323223371711, %T A252016 223232233717232233722323223371711159, %U A252016 232233722323223371711223232233717232233722323223371711159007 %N A252016 a(1)=2, a(2)=23; thereafter a(n) is the smallest prime which begins with the concatenation a(n-2)a(n-1). %C A252016 a(4) = 2322337 == 23, 223, 37 %H A252016 Alois P. Heinz, <a href="/A252016/b252016.txt">Table of n, a(n) for n = 1..13</a> %Y A252016 Cf. A240563. %K A252016 nonn,base %O A252016 1,1 %A A252016 _Giovanni Teofilatto_, Dec 13 2014 %E A252016 a(6)-a(8) from _Alois P. Heinz_, Jan 01 2015