id:A010685 - OEIS Search Results

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Period 2.

+0
3

1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1, 4, 1 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.:(1+4x)/((1-x)(1+x)); E.g.f.:(5exp(x)-3exp(-x))/2; a(n)=(5-3(-1)^n)/2; a(n)=4^((1-(-1)^n)/2)=2^(1-(-1)^n)=2/(2^((-1)^n)); a(n)=4^(ceiling(n/2)-floor(n/2)). - Paul Barry (pbarry(AT)wit.ie), Jun 03 2003` `a(n)=gcd((n-1)^2, (n+1)^2) - Paul Barry (pbarry(AT)wit.ie), Sep 16 2004` `a(n) = 4*(n mod 2)+(n+1) mod 2 - Paolo P. Lava (ppl(AT)spl.at), Oct 20 2006`
	MAPLE	`[seq (modp((3*n+1), 6), n=0..80)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 30 2006`
	CROSSREFS	`Sequence in context: A030748 A096622 A080905 this_sequence A099301 A050347 A126114` `Adjacent sequences: A010682 A010683 A010684 this_sequence A010686 A010687 A010688`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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