OFFSET
1,3
COMMENTS
Conjecture: the sequence is finite.
FORMULA
A137581(a(n)) = 0.
EXAMPLE
PROG
(PARI) isok(k) = my(f=k!); while(!(f % 10), f \= 10); #select(x->(x == 0), digits(f)) == 0; \\ Michel Marcus, Jun 28 2023
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Reinhard Zumkeller, Jan 27 2008
STATUS
approved