OFFSET

0,2

EXAMPLE

a(1)=5: 5!=120, which has only 1 zero. Other numbers with only 1 zero are 6 and 9.

a(2)=7 since 7th factorial, i.e., 7!=5040 contains exactly two 0's.

a(3)=0 since no factorial contains just three zeros.

CROSSREFS

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Jul 31 2002

EXTENSIONS

Edited by N. J. A. Sloane, Sep 06 2008 at the suggestion of R. J. Mathar

STATUS

approved