1,2

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.

Table of n, a(n) for n=1..26.

Cf. A056544, A082216.

Sequence in context: A004915 A135385 A087051 * A082935 A077739 A078213

Adjacent sequences: A082214 A082215 A082216 * A082218 A082219 A082220

base,easy,nonn

Amarnath Murthy and Meenakshi Shrikant (menakan_s(AT)yahoo.com), Apr 09 2003

approved