id:A024361 - OEIS Search Results

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Number of primitive Pythagorean triangles with leg n.

+0
8

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

	OFFSET	`1,12`
	COMMENT	`Consider primitive Pythagorean triangles (A^2 + B^2 = C^2, (A, B) = 1, A <= B); sequence gives number of times AUB takes value n.` `For n>1, a(n)=0 for n=A016825=2(mod 4). Also, number of ways of expressing n as a difference of two coprime squares. - Lekraj Beedassy (blekraj(AT)yahoo.com), Sep 28 2004`
	LINKS	`Ron Knott, Pythagorean Triples and Online Calculators` `Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	CROSSREFS	`Cf. A024362, A046079.` `Cf. A020883; A020884.` `Sequence in context: A029296 A096419 A130182 this_sequence A135486 A030187 A117278` `Adjacent sequences: A024358 A024359 A024360 this_sequence A024362 A024363 A024364`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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