A120891 - OEIS

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A120891

Number of primitive Pythagorean triangles with odd leg 2n+1.

1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 4, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 2, 2, 1, 4, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 4, 1, 1, 2, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,7`
	COMMENTS	`Bisection of A024361.`
	FORMULA	`a(n)=2^(k-1), where k=A092523(n+1).`
	CROSSREFS	`Cf. A120890.` `Sequence in context: A192004 A120889 A092523 * A034002 A025430 A110955` `Adjacent sequences: A120888 A120889 A120890 * A120892 A120893 A120894`
	KEYWORD	`nonn`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 12 2006`

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Last modified February 13 12:58 EST 2012. Contains 205482 sequences.