OFFSET
1,1
EXAMPLE
a(2)=39916800 so 39916800 is the smallest factorial containing exactly two 9's.
MATHEMATICA
With[{fs=Range[100]!}, Flatten[Table[Select[fs, DigitCount[#, 10, 9]==n&, 1], {n, 10}]]] (* Harvey P. Dale, Mar 12 2013 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Jul 30 2002
EXTENSIONS
More terms from Harvey P. Dale, Mar 12 2013
STATUS
approved