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 A214427 #7 Feb 17 2013 23:58:45
%S A214427 10,5,3,6,10,3,4,4,9,7,4,6,6,4,5,4,6,10,7,6,8,3,4,9,6,5,7,10,3,9,7,5,
%T A214427 6,10,8,5,6,8,8,10,3,8,6,9,6,5,4,5,7,10,9,8,9,8,6,2,5,7,10,8,2,6,6,10,
%U A214427 2,4,7,3,6,10,7,8,7,5,6,9,7,10,3,7,2,10,3
%N A214427 The base for which A214423(n) is palindromic.
%H A214427 T. D. Noe, <a href="/A214427/b214427.txt">Table of n, a(n) for n = 1..1000</a>
%t A214427 n = -1; t = {}; While[Length[t] < 100, n++; u = Table[s = IntegerDigits[n, m]; s == Reverse[s], {m, 2, 10}]; u2 = Position[u, True]; If[Length[u2] == 1, AppendTo[t, 1 + u2[[1,1]]]]]
%K A214427 nonn,base
%O A214427 1,1
%A A214427 _T. D. Noe_, Jul 18 2012