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 A082217 #7 Dec 05 2013 20:06:33 %S A082217 1,2,3,4,5,6,7,8,9,10801,11711,12621,13531,14441,15351,16261,17171, %T A082217 1881,0,208802,2139312,227722,2329232,246642,2519152,265562 %N A082217 Smallest palindrome beginning with n and digit sum n, or 0 if no such number exists. %C A082217 a(19) = 0. This is the only zero in the sequence. Every other integer k > 9 has digit sum <= k/2, so the center can always be filled in to make a palindrome. %Y A082217 Cf. A056544, A082216. %K A082217 base,easy,nonn %O A082217 1,2 %A A082217 _Amarnath Murthy_ and Meenakshi Shrikant (menakan_s(AT)yahoo.com), Apr 09 2003