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 A068065 #3 Mar 30 2012 17:27:34 %S A068065 0,2,4,6,8,11,101,141,161,181,1001,10001,10201,10401,10601,10801, %T A068065 100001,1000001,1002001,1004001,1006001,1008001,10000001,100000001, %U A068065 100020001,100040001,100060001,100080001,1000000001,10000000001 %N A068065 Palindromes n for which there is a unique k such that n = k + reverse(k). %C A068065 Subsequence of A068062; A068062(k) is in this sequence if and only if A068064(k) = 1. At first sight, 121 seems to be missing, but in fact 121 does not belong here (cf. example in A068064). %e A068065 10601 is in the sequence, since 10601 = 10300 + 00301 and for no other k we have 10601 = k + reverse(k). %Y A068065 Cf. A002113, A067030, A067032, A068062, A068064. %K A068065 base,nonn %O A068065 1,2 %A A068065 _Klaus Brockhaus_, Feb 16 2002