id:A045766 - OEIS Search Results

Search: id:A045766

Displaying 1-1 of 1 results found.

page 1

Number of prime factors of double factorials n!! (A006882), with multiplicity.

+0
1

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; listen)

	OFFSET	`1,4`
	LINKS	`Index entries for sequences related to factorial numbers`
	EXAMPLE	`8!!=8642=2^3232^22=2^73. Eight prime factors, so a(8)=8.`
	CROSSREFS	`Sequence in context: A086670 A075888 A075889 this_sequence A132817 A131025 A070151` `Adjacent sequences: A045763 A045764 A045765 this_sequence A045767 A045768 A045769`
	KEYWORD	`nonn,easy`
	AUTHOR	`Jeff Burch (gburch(AT)erols.com)`

page 1

Search completed in 0.002 seconds

Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research