id:A131756 - OEIS Search Results

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Period 3: repeat 2, -1, 3.

+0
2

2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3, 2, -1, 3 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n)=(1/9){7(n mod 3)-8[(n+1) mod 3]+13[(n+3) mod 3]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Oct 08 2007` `a(n) = 4/3+2/3cos(2/3Pin)-4/33^(1/2)sin(2/3Pin). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 15 2007` `G.f.: (2-x+3x^2)/(1-x^3) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 24 2009]`
	PROGRAM	`(PARI) a(n)=[2, -1, 3][1+n%3] [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 24 2009]`
	CROSSREFS	`Cf. A130784.` `Sequence in context: A076081 A107338 A118123 this_sequence A085014 A082074 A132283` `Adjacent sequences: A131753 A131754 A131755 this_sequence A131757 A131758 A131759`
	KEYWORD	`sign,easy`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Oct 04 2007`

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

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