A079690 Number of 5's in n!.

0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 0, 1, 0, 2, 0, 3, 3, 2, 2, 2, 4, 3, 1, 2, 2, 2, 2, 5, 1, 2, 5, 6, 5, 7, 5, 5, 8, 5, 6, 5, 2, 4, 7, 3, 3, 11, 5, 6, 5, 5, 3, 7, 6, 4, 7, 10, 3, 7, 8, 5, 10, 7, 3, 7, 13, 9, 10, 6, 9, 7, 14, 13, 1, 12, 8, 13, 13, 11, 10, 10, 12, 17, 17, 14, 15, 12

Offset

0,18

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Index entries for sequences related to factorial numbers.

Formula

a(n) = A034886(n) - (A027869(n) + A079680(n) + A079714(n) + A079684(n) + A079688(n) + A079691(n) + A079692(n) + A079693(n) + A079694(n)). - Reinhard Zumkeller, Jan 27 2008

Mathematica

DigitCount[#, 10, 5]&/@(Range[0, 100]!) (* Harvey P. Dale, Sep 17 2016 *)

Crossrefs

Cf. A027869, A079714.

Cf. A000142, A137579, A137580.

Sequence in context: A351619 A078659 A374080 * A328620 A257510 A305445

Adjacent sequences: A079687 A079688 A079689 * A079691 A079692 A079693

Keyword

nonn,base,easy

Author

Cino Hilliard, Jan 31 2003

Status

approved