OFFSET
0,6
COMMENTS
a(n) <= A137577(n).
EXAMPLE
n=10: 10! = 3628800 => a(10) = Min{1,4,5,7,9} = 1;
n=11: 11! = 39916800 => a(11) = Min{2,4,5,7} = 2.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Jan 27 2008
STATUS
approved