A079294 - OEIS

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A079294

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

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; refs; listen; history; internal format)

	OFFSET	`0,11`
	LINKS	`S. S. Wagstaff, Jr., Factors of Bernoulli numbers`
	PROG	`(PARI) a(n)=omega(numerator(bernfrac(2*n)))`
	CROSSREFS	`Cf. A046886.` `Sequence in context: A085239 A126014 A051686 * A076733 A079643 A118480` `Adjacent sequences: A079291 A079292 A079293 * 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 February 14 17:27 EST 2012. Contains 205644 sequences.