id:A131806 - OEIS Search Results

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Period 4: repeat 0,2,4,6.

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0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6, 0, 2, 4, 6 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Salvatore Gambino, Terne pitagoriche primitive`
	FORMULA	`a(n) = 3+(-1)^n+2(-1)^((2n+1-(-1)^n)/4)` `O.g.f.: -2x^2(1+2x+3x^2)/((x-1)(x+1)(x^2+1)) . a(n) = 2A010873(n-1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 15 2008` `a(n)=2(n mod 4), with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jan 28 2008` `a(n)=3-(1-I)I^n-(-1)^n-(1+I)(-I)^n, with n>=0 and I=sqrt(-1) - Paolo P. Lava (ppl(AT)spl.at), Jul 17 2008`
	CROSSREFS	`Sequence in context: A056683 A066684 A128124 this_sequence A004518 A013670 A121206` `Adjacent sequences: A131803 A131804 A131805 this_sequence A131807 A131808 A131809`
	KEYWORD	`nonn,easy`
	AUTHOR	`Salvatore Gambino (salvatore.gambino(AT)fastwebnet.it), Oct 04 2007`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 15 2008`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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