id:A134857 - OEIS Search Results

Search: id:A134857

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Numbers that can be written as (a^2-1)(b^2-1) in four or more distinct ways.

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241920, 1048320, 10200960, 25724160, 37255680, 93139200, 123963840, 245044800, 588107520, 819786240, 1407893760, 1871251200, 3758169600, 5886558720, 8553283200, 10783342080, 13470367680, 19769460480, 30791819520, 40446806400 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Subsequence of A134856. Contains A134858 as a subsequence.`
	LINKS	`MathPages, Numbers Expressible As (a^2-1)(b^2-1).`
	EXAMPLE	`241920 = (4^2-1)(127^2-1) = (7^2-1)(71^2-1) = (9^2-1)(55^2-1) = (17^2-1)(29^2-1).`
	CROSSREFS	`Cf. A134856, A134858.` `Adjacent sequences: A134854 A134855 A134856 this_sequence A134858 A134859 A134860` `Sequence in context: A122210 A015345 A127881 this_sequence A078871 A066082 A083623`
	KEYWORD	`easy,nonn`
	AUTHOR	`Herman Beeksma (herman(AT)beeksma.nl), Nov 13 2007`

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Last modified January 8 02:43 EST 2009. Contains 152824 sequences.

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