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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A045766 Number of prime factors of double factorials n!! (A006882), with multiplicity. 0
0, 1, 1, 3, 2, 5, 3, 8, 5, 10, 6, 13, 7, 15, 9, 19, 10, 22, 11, 25, 13, 27, 14, 31, 16, 33, 19, 36, 20, 39, 21, 44, 23, 46, 25, 50, 26, 52, 28, 56, 29, 59, 30, 62, 33, 64, 34, 69, 36, 72, 38, 75, 39, 79, 41, 83, 43, 85, 44, 89, 45, 91, 48, 97, 50, 100, 51, 103, 53, 106, 54, 111 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

LINKS

Index entries for sequences related to factorial numbers

EXAMPLE

8!!=8*6*4*2=2^3*2*3*2^2*2=2^7*3. Eight prime factors, so a(8)=8.

CROSSREFS

Sequence in context: A075888 A075889 A181771 * A132817 A131025 A070151

Adjacent sequences:  A045763 A045764 A045765 * A045767 A045768 A045769

KEYWORD

nonn,easy

AUTHOR

Jeff Burch (gburch(AT)erols.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 15 12:05 EST 2012. Contains 205782 sequences.