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 A131316 #12 Oct 02 2013 15:47:31 %S A131316 2,11,1117,11113,111119,3333331,11111117,111111113,4444444447, %T A131316 11111111113,444444444443,5555555555551,22222222222229, %U A131316 222222222222227,11111111111111101,11111111111111119,222222222222222221,8888888888888888881,1111111111111111111 %N A131316 Smallest prime beginning with exactly n identical digits. %H A131316 Alois P. Heinz, <a href="/A131316/b131316.txt">Table of n, a(n) for n = 1..200</a> %e A131316 a(4) = 11113 because 11113 is the smallest prime beginning with exactly 4 identical digits. %e A131316 a(18) = 8888888888888888881 > a(19) = 1111111111111111111, which begins with exactly 19 identical digits. - _Alois P. Heinz_, Sep 05 2011 %Y A131316 Different from A034388. %K A131316 base,nonn %O A131316 1,1 %A A131316 _Shyam Sunder Gupta_, Sep 29 2007 %E A131316 More terms from _Alois P. Heinz_, Sep 05 2011