A070085 - OEIS

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A070085

A070080(n)^2 + A070081(n)^2 - A070082(n)^2.

1, 1, 4, 1, -1, 4, 1, -3, 9, 4, 2, 1, -5, -7, 9, 4, 0, 16, 1, -7, -11, 9, 7, 4, -2, -4, 16, 1, -9, -15, 9, -17, 5, 25, 4, -4, -8, 16, 14, 1, -11, -19, 9, -23, 3, 1, 25, 4, -6, -12, 16, -14, 12, 36, 1, -13, -23, 9, -29, 1, -31, -3, 25, 23, 4, -8 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`The integer triangle [A070080(n)<=A070081(n)<=A070082(n)] is` `acute iff a(n)>0, right iff a(n)=0 and obtuse iff a(0)<0.`
	LINKS	`R. Zumkeller, Integer-sided triangles` `Eric Weisstein's World of Mathematics, Acute Triangle.` `Eric Weisstein's World of Mathematics, Right Triangle.` `Eric Weisstein's World of Mathematics, Obtuse Triangle.`
	CROSSREFS	`Cf. A070093, A070101, A024155, A070118, A070127, A070136.` `Sequence in context: A097322 A177023 A080278 * A131776 A010322 A053239` `Adjacent sequences: A070082 A070083 A070084 * A070086 A070087 A070088`
	KEYWORD	`sign`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 05 2002`

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.