id:A120891 - OEIS Search Results

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A120891

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

+0
2

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; listen)

	OFFSET	`1,7`
	COMMENT	`Bisection of A024361.`
	FORMULA	`a(n)=2^(k-1), where k=A092523(n+1).`
	CROSSREFS	`Cf. A120890.` `Sequence in context: A030382 A120889 A092523 this_sequence A034002 A025430 A110955` `Adjacent sequences: A120888 A120889 A120890 this_sequence A120892 A120893 A120894`
	KEYWORD	`nonn`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 12 2006`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research