id:A126090 - OEIS Search Results

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a(1)=1. a(n) = the number of terms among {a(1),a(2),...a(n-1)} which are coprime to exactly one distinct prime dividing n.

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1, 1, 2, 2, 4, 3, 6, 3, 5, 5, 10, 6, 12, 7, 8, 5, 16, 8, 18, 13, 7, 11, 22, 10, 17, 14, 18, 16, 28, 9, 30, 11, 12, 20, 11, 16, 36, 22, 12, 23, 40, 14, 42, 28, 19, 29, 46, 22, 39, 28, 15, 33, 52, 28, 16, 29, 17, 36, 58, 20, 60, 38, 25, 22, 15, 23, 66, 43, 23, 20, 70, 37, 72, 45 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`Diana Mecum, Table of n, a(n) for n = 1..500` `Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`There are 6 terms among the first 11 terms of the sequence which are each coprime to exactly one distinct prime dividing 12 (a(3)=2, a(4)=2, a(5)=4, a(6)=3, a(8)=3 and a(11)=10). So a(12) = 6.`
	CROSSREFS	`Cf. A126080.` `Sequence in context: A087656 A122811 A089173 this_sequence A058266 A138664 A140357` `Adjacent sequences: A126087 A126088 A126089 this_sequence A126091 A126092 A126093`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Mar 03 2007`
	EXTENSIONS	`More terms from Diana Mecum (diana.mecum(AT)gmail.com), Jun 23 2007`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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