id:A079294 - OEIS Search Results

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Number of distinct prime factors of the numerator of the 2n-th Bernoulli number.

+0
3

0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 3, 2, 2, 3, 3, 3, 2, 1, 2, 2, 1, 5, 3, 3, 3, 5, 3, 4, 5, 3, 5, 2, 3, 6, 5, 2, 2, 3, 4, 5, 4, 5, 4, 4, 4, 4, 6, 5, 6, 5, 7, 5, 5, 3, 6, 4, 2, 5, 2, 3, 4, 9, 4, 6, 7, 4, 5, 4, 8, 8, 4, 2, 7, 7, 7, 7, 8, 5, 8, 6, 5, 8, 9, 6, 5, 3, 8 (list; graph; listen)

	OFFSET	`0,11`
	LINKS	`S. S. Wagstaff, Jr., Factors of Bernoulli numbers`
	PROGRAM	`(PARI) a(n)=omega(numerator(bernfrac(2*n)))`
	CROSSREFS	`Cf. A046886.` `Sequence in context: A085239 A126014 A051686 this_sequence A076733 A079643 A118480` `Adjacent sequences: A079291 A079292 A079293 this_sequence A079295 A079296 A079297`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 09 2003`
	EXTENSIONS	`More terms from T. D. Noe (noe(AT)sspectra.com), Feb 13 2004`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

AT&T Labs Research