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 A068910 #3 Mar 30 2012 17:27:34 %S A068910 0,1,2,3,4,10,100,120,130,140,1000,10000,10100,10200,10300,10400, %T A068910 100000,1000000,1001000,1002000,1003000,1004000,10000000,100000000, %U A068910 100010000,100020000,100030000,100040000,1000000000,10000000000 %N A068910 a(n) is the unique k such that palindrome A068065(n) = k + reverse(k). %e A068910 a(14) = 10300, since A068065(14) = 10601 = 10300 + 00301 and for no other k we have 10601 = k + reverse(k). %Y A068910 Cf. A068065. %K A068910 base,nonn %O A068910 0,3 %A A068910 _Klaus Brockhaus_, Mar 05 2002