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 A103701 #2 Mar 30 2012 17:31:12
%S A103701 1,3,5,7,9,11,3,3,5,5,7,7,9,9,11,11,3,3,3,3,5,5,5,5,7,7,7,7,9,9,9,9,
%T A103701 11,11,11,11,3,3,3,3,3,3,3,3,5,5,5,5,5,5,5,5,7,7,7,7,7,7,7,7,9,9,9,9,
%U A103701 9,9,9,9,11,11,11,11,11,11,11,11,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,5,5,5,5,5,5
%N A103701 Add 2 to each of the preceding digits, beginning with 1.
%t A103701 Flatten[ NestList[ Function[x, Flatten[ IntegerDigits[x] + 2]], {1}, 22]]
%Y A103701 Cf. A103694, A103702, A103703, A103704, A103705, A103706, A103707, A103708.
%K A103701 base,nonn
%O A103701 1,2
%A A103701 _Robert G. Wilson v_, Feb 12 2005