id:A072048 - OEIS Search Results

Search: id:A072048

Displaying 1-1 of 1 results found.

page 1

A072048

Number of divisors of the square-free numbers: tau(A005117(n)).

+0
4

1, 2, 2, 2, 4, 2, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 4, 2, 8, 2, 4, 4, 4, 2, 4, 4, 2, 8, 2, 4, 2, 4, 2, 4, 4, 4, 2, 2, 4, 4, 8, 2, 4, 8, 2, 2, 4, 4, 8, 2, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 2, 2, 8, 2, 8, 4, 2, 2, 8, 4, 2, 8, 4, 4, 4, 4, 4, 2, 4, 8, 2, 4, 4, 2, 8, 2, 4, 4, 4, 4, 4, 2, 2, 8, 4, 2 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = 2^A072047(n) = 2^A001221(A005117(n)).` `Also the number of cube-free numbers with the same square-free kernel as the n-th square-free number, see A073245.`
	CROSSREFS	`a(n) = A000005(A005117(n)), A062822.` `Sequence in context: A066761 A108920 A079405 this_sequence A161841 A152674 A072056` `Adjacent sequences: A072045 A072046 A072047 this_sequence A072049 A072050 A072051`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 09 2002`

page 1

Search completed in 0.002 seconds

Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

AT&T Labs Research