id:A057951 - OEIS Search Results

Search: id:A057951

Displaying 1-1 of 1 results found.

page 1

Number of prime factors of 10^n - 1 (counted with multiplicity).

+0
15

2, 3, 4, 4, 4, 7, 4, 6, 6, 6, 4, 9, 5, 6, 8, 8, 4, 11, 3, 9, 9, 9, 3, 12, 7, 8, 9, 10, 7, 15, 5, 13, 8, 8, 9, 14, 5, 5, 8, 13, 6, 17, 6, 13, 12, 8, 4, 15, 6, 12, 10, 11, 6, 16, 10, 14, 8, 10, 4, 22, 9, 7, 16, 17, 9, 17, 5, 12, 8, 14, 4, 20, 5, 9, 14, 8, 10, 18, 8, 17, 15, 9, 5, 24, 9, 10, 12 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) = Omega(10^n -1) = Omega(R_n) + 2 = A046053(n) + 2 {where Omega(n)=A001222(n) and R_n=(10^n -1)/9=A002275(n)}. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 09 2006`
	LINKS	`S. S. Wagstaff, Jr., Main Tables from the Cunningham Project.` `S. S. Wagstaff, Jr., The Cunningham Project`
	FORMULA	`Mobius transform of A085035 - T. D. Noe (noe(AT)sspectra.com), Jun 19 2003`
	CROSSREFS	`Cf. A057952-A057958, A046051.` `Cf. A085035.` `Sequence in context: A131798 A114212 A108355 this_sequence A076410 A058277 A065852` `Adjacent sequences: A057948 A057949 A057950 this_sequence A057952 A057953 A057954`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 2000.`

page 1

Search completed in 0.002 seconds

Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

AT&T Labs Research