id:A131800 - OEIS Search Results

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Period 4: repeat 1,2,5,6.

+0
2

1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6, 1, 2, 5, 6 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Salvatore Gambino, Terne pitagoriche primitive`
	FORMULA	`a(n) = (7+(-1)^n+4(-1)^(2n+1-(-1)^n)/4)/2` `O.g.f.: -(1+2x+5x^2+6x^3)/((x-1)(x+1)(x^2+1)) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 13 2008` `a(n)=(1/6){11(n mod 4)+2[(n+1) mod 4]-[(n+2) mod 4]+2[(n+3) mod 4]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jan 28 2008` `a(n)=7/2-(1-I)I^n-1/2(-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: A111987 A004650 A138279 this_sequence A086038 A134387 A145058` `Adjacent sequences: A131797 A131798 A131799 this_sequence A131801 A131802 A131803`
	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 13 2008`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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