A144797 - OEIS

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A144797

Numbers n such that 2*n^2+17 is a square

2, 4, 16, 26, 94, 152, 548, 886, 3194, 5164, 18616, 30098, 108502, 175424, 632396, 1022446, 3685874, 5959252 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`Index to sequences with linear recurrences with constant coefficients, signature (0,6,0,-1).`
	FORMULA	`G.f. 2x(1+x)(1+x+x^2) / ( (x^2+2x-1)(x^2-2x-1) ). - R. J. Mathar, Nov 27 2011` `a(n) = 2*A077241(n-1). - R. J. Mathar, Nov 27 2011`
	EXAMPLE	`a(1)=2 because 2*4+17=25=5^2`
	CROSSREFS	`A133301` `Sequence in context: A015775 A104258 A143904 * A173746 A095803 A032464` `Adjacent sequences: A144794 A144795 A144796 * A144798 A144799 A144800`
	KEYWORD	`nonn`
	AUTHOR	`Richard Choulet (richardchoulet(AT)yahoo.fr), Sep 21 2008`
	EXTENSIONS	`Corrected by R. J. Mathar, Nov 27 2011`

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.