OFFSET
1,1
COMMENTS
Since any 5-digit member of A144688 must end in 0 or 5, a(5) = 2*a(4).
Similarly a(n) <= 2*a(n-1) for n = 6, 7, 8, 9, a(10) = a(9), and a(n) <= a(n-1) for n >= 11.
a(n) = 0 for n > 25.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Zak Seidov and N. J. A. Sloane, Feb 08 2009
STATUS
approved