id:A141584 - OEIS Search Results

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a(n) = the closest multiple of A053669(2n) to 2n. A053669(2n) = the smallest prime coprime to 2n.

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3, 3, 5, 9, 9, 10, 15, 15, 20, 21, 21, 25, 27, 27, 28, 33, 33, 35, 39, 39, 40, 45, 45, 50, 51, 51, 55, 57, 57, 63, 63, 63, 65, 69, 69, 70, 75, 75, 80, 81, 81, 85, 87, 87, 91, 93, 93, 95, 99, 99, 100, 105, 105, 110, 111, 111, 115, 117, 117, 119, 123, 123, 125, 129, 129, 130 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`The smallest prime coprime to 30 is 7. The largest multiple of 7 that is < 30 is 28. The smallest multiple of 7 that is > 30 is 35. 28 is closer to 30 than 35 is, so a(15) = 28.`
	CROSSREFS	`Cf. A053669.` `Sequence in context: A087343 A079586 A125960 this_sequence A136791 A091916 A102437` `Adjacent sequences: A141581 A141582 A141583 this_sequence A141585 A141586 A141587`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Aug 19 2008`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 22 2009`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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