id:A144965 - OEIS Search Results

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a(n)= 4*n*(4*n^2+1).

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0, 20, 136, 444, 1040, 2020, 3480, 5516, 8224, 11700, 16040, 21340, 27696, 35204, 43960, 54060, 65600, 78676, 93384, 109820, 128080, 148260, 170456, 194764, 221280, 250100, 281320, 315036, 351344, 390340, 432120, 476780, 524416, 575124 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`(a(n))^2 + (n*a(n)+1)^2 is always a perfect square.`
	LINKS	`Luc Comeau-Montasse, Des mesures entieres pour des triangles rectangles`
	EXAMPLE	`Example : n = 181, a(n) = 94876580 (94876580^2 + (94876580*181 + 1)^2) = 17172923069.`
	CROSSREFS	`Sequence in context: A156392 A085284 A105573 this_sequence A140301 A134382 A105939` `Adjacent sequences: A144962 A144963 A144964 this_sequence A144966 A144967 A144968`
	KEYWORD	`easy,nonn`
	AUTHOR	`Luc Comeau-Montasse (lebateleur2(AT)gmail.com), Sep 27 2008`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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