A052454 - OEIS

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A052454

Positive integer values of n such that 10n^2 - 9 is a square.

1, 3, 13, 25, 111, 493, 949, 4215, 18721, 36037, 160059, 710905, 1368457, 6078027, 26995669 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`It appears that a(n)=38a(n-3)-a(n-6).`
	EXAMPLE	`25 is a term of the sequence since 10*25^2-9 = 6241 = 79^2.`
	CROSSREFS	`Cf. A082651, A077442.` `Sequence in context: A056714 A120074 A056706 * A066947 A031011 A099062` `Adjacent sequences: A052451 A052452 A052453 * A052455 A052456 A052457`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), May 20 2003`

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Last modified February 16 09:00 EST 2012. Contains 205904 sequences.