login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A027869 Number of 0's in n!. 17
0, 0, 0, 0, 0, 1, 1, 2, 2, 1, 2, 2, 4, 4, 2, 4, 4, 4, 5, 6, 7, 7, 8, 5, 6, 9, 8, 9, 10, 7, 9, 7, 10, 8, 11, 9, 10, 12, 16, 12, 9, 15, 13, 13, 12, 13, 16, 11, 14, 14, 19, 18, 18, 17, 18, 18, 17, 20, 17 (list; graph; refs; listen; history; internal format)
OFFSET

0,8

LINKS

Index entries for sequences related to factorial numbers.

FORMULA

a(n) = A034886(n) - (A079680(n) + A079714(n) + A079684(n) + A079688(n) + A079690(n) + A079691(n) + A079692(n) + A079693(n) + A079694(n)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 27 2008

A027868(n) <= a(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 27 2008

CROSSREFS

Cf. A000142, A137579, A137580.

Sequence in context: A070215 A071457 A115034 * A156748 A075445 A194447

Adjacent sequences:  A027866 A027867 A027868 * A027870 A027871 A027872

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 00:47 EST 2012. Contains 205567 sequences.