id:A139047 - OEIS Search Results

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a(0)=a(1)=1. For n >= 2, if a(n-1) is coprime to n, then a(n) = a(n-1)+a(n-2). Otherwise, a(n)=1.

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1, 1, 2, 3, 5, 1, 6, 7, 13, 20, 1, 21, 1, 22, 1, 23, 24, 47, 71, 118, 1, 119, 120, 239, 359, 598, 1, 599, 600, 1199, 1799, 2998, 1, 2999, 3000, 1, 3001, 3002, 1, 3003, 3004 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Jasper Mulder, Table of n, a(n) for n=0..12500` `Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`16 is coprime to a(15) = 23, so a(16) = a(15)+a(14) = 23+1 = 24. 20 is not coprime to a(19) = 118, so a(20)=1.`
	CROSSREFS	`Sequence in context: A128047 A105870 A096534 this_sequence A121053 A132597 A030335` `Adjacent sequences: A139044 A139045 A139046 this_sequence A139048 A139049 A139050`
	KEYWORD	`more,nonn`
	AUTHOR	`Leroy Quet Jun 01 2008`
	EXTENSIONS	`More terms from Jasper Mulder (jasper.mulder(AT)planet.nl), Oct 12 2009`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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