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 A082205 #13 Aug 25 2015 16:08:10
%S A082205 1,22,232,3223,22322,232232,3223223,22322322,232232232,3223223223,
%T A082205 22322322322,232232232232,3223223223223,22322322322322,
%U A082205 232232232232232,3223223223223223,22322322322322322,232232232232232232,3223223223223223223
%N A082205 Palindromes pertaining to A082204.
%C A082205 Perhaps no digits other than 1,2 and 3 occur. From the second term onwards the periodic pattern of two 2's followed by a 3 holds.
%H A082205 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 1001, 0, 0, -1000).
%e A082205 The first six palindromes are: 1, 22, 232, 3223,22322, 232232.
%t A082205 Join[{1},LinearRecurrence[{0, 0, 1001, 0, 0, -1000},{22, 232, 3223, 22322, 232232, 3223223},18]] (* _Ray Chandler_, Aug 25 2015 *)
%Y A082205 Cf. A082204, A082206.
%K A082205 base,easy,nonn
%O A082205 1,2
%A A082205 _Amarnath Murthy_, Apr 10 2003
%E A082205 More terms from _Joshua Zucker_, May 08 2006