1,1

Conjecture: a(n) = 0 if and only if n > 3 and n begins with 2,4,6,8 or 5 (most significant digit).

Table of n, a(n) for n=1..69.

Sequence in context: A040118 A099268 A070277 * A231433 A240454 A099756

Adjacent sequences: A109861 A109862 A109863 * A109865 A109866 A109867

base,nonn

Amarnath Murthy, Jul 08 2005

Corrected and extended by Giovanni Resta, Feb 07 2006

approved