OFFSET
1,2
EXAMPLE
a(8)=7 because 8!=40320=2^7*3^2*5*7 has the seven divisors 1, 2, 3, 5, 8, 21 and 144 which are also Fibonacci numbers.
MAPLE
MATHEMATICA
ndf[n_]:=Length[Intersection[fibs, Divisors[n!]]]; fibs=Fibonacci[ Range[600]]; Array[ndf, 75] (* Harvey P. Dale, Jun 24 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Oct 31 2007
STATUS
approved