id:A132593 - OEIS Search Results

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Sequence allows us to find X values of the equation: X(X + 1) - 10*Y^2 = 0.

+0
1

0, 9, 360, 13689, 519840, 19740249, 749609640, 28465426089 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(0)=0, a(1)=9 and a(n)=38a(n-1) - a(n-2) + 18.` `a(n)=-1/2+(1/4)[19-6sqrt(10)]^n+(1/4)[19+6*sqrt(10)]^n, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jul 11 2008`
	CROSSREFS	`Cf. A007654.` `Sequence in context: A119756 A063068 A130558 this_sequence A051848 A124042 A012191` `Adjacent sequences: A132590 A132591 A132592 this_sequence A132594 A132595 A132596`
	KEYWORD	`nonn`
	AUTHOR	`Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Nov 14 2007`

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Last modified December 4 15:51 EST 2008. Contains 151308 sequences.