id:A070141 - OEIS Search Results

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Number of obtuse integer triangles with perimeter n having integral area.

+0
4

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 1, 0, 0, 0, 3, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 0, 1, 0, 1, 0, 2, 0, 0, 0, 4, 0, 0, 0, 1, 0, 2 (list; graph; listen)

	OFFSET	`1,36`
	COMMENT	`a(n) = A051516(n) - A070140(n) - A024155(n).`
	LINKS	`Eric Weisstein's World of Mathematics, Heronian Triangle.` `Eric Weisstein's World of Mathematics, Obtuse Triangle.` `R. Zumkeller, Integer-sided triangles`
	CROSSREFS	`Cf. A051516, A070101, A070147.` `Adjacent sequences: A070138 A070139 A070140 this_sequence A070142 A070143 A070144` `Sequence in context: A094428 A082786 A101638 this_sequence A088722 A122180 A033772`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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