id:A009005 - OEIS Search Results

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All natural numbers except 1, 2 and 4.

+0
4

3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Short legs of Pythagorean triangles.` `Also the natural numbers n such that there is an open knight's tour of the 4 X n chessboard. - Additional comments from Sharon Sela (sharonsela(AT)hotmail.com), Jan 02 2002`
	LINKS	`IBM Ponder This, 2001`
	FORMULA	`O.g.f.: x(3-x-x^2)/(1-x)^2. a(n)=A009056(n), n>1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 26 2008`
	CROSSREFS	`Adjacent sequences: A009002 A009003 A009004 this_sequence A009006 A009007 A009008` `Sequence in context: A036496 A009004 A005527 this_sequence A138884 A008521 A039231`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`
	EXTENSIONS	`Additional comments from Sharon Sela (sharonsela(AT)hotmail.com), Jan 02 2002`

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

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