%N Smallest palindrome beginning with n and digit sum n, or 0 if no such number exists.
%C 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 Cf. A056544, A082216.
%A _Amarnath Murthy_ and Meenakshi Shrikant (menakan_s(AT)yahoo.com), Apr 09 2003