A066877 - OEIS

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A066877

a(n) = omega(n!-1), where omega is the number of distinct primes dividing n, A001221.

0, 0, 1, 1, 2, 1, 1, 2, 2, 2, 4, 1, 2, 1, 4, 2, 3, 3, 3, 2, 4, 3, 2, 2, 3, 2, 2, 4, 5, 1, 3, 1, 1, 2, 3, 2, 5, 1, 4, 2, 4, 4, 7, 4, 5, 5, 2, 4, 3, 2, 5, 6, 4, 6, 6, 5, 6, 5, 2, 3 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	LINKS	`Hisanori Mishima, Appendix 1. Factorization results for n!-1`
	MATHEMATICA	`Table[ Length[ FactorInteger[ n! - 1]], {n, 1, 30}]`
	CROSSREFS	`Sequence in context: A145788 A117592 A117942 * A029255 A029272 A153904` `Adjacent sequences: A066874 A066875 A066876 * A066878 A066879 A066880`
	KEYWORD	`hard,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 21 2002`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.