0,10

Table of n, a(n) for n=0..84.

a(n) =A090622(n, 9) =[A054861(n)/2] =[([n/3]+[n/9]+[n/27]+[n/81]+...)/2].

a(9)=2 since 9!=362880=9^2*4480.

IntegerExponent[Range[0, 90]!, 9] (* Harvey P. Dale, Jun 07 2016 *)

Cf. A011371, A054861, A090616, A027868, A054896, A090617.

Sequence in context: A280952 A235122 A131996 * A186444 A072748 A174631

Adjacent sequences: A090615 A090616 A090617 * A090619 A090620 A090621

nonn

Henry Bottomley, Dec 06 2003

approved