id:A029718 - OEIS Search Results

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Numbers of form 2x^2 + 2xy + 3y^2.

+0
1

0, 2, 3, 7, 8, 10, 12, 15, 18, 23, 27, 28, 32, 35, 40, 42, 43, 47, 48, 50, 58, 60, 63, 67, 72, 75, 82, 83, 87, 90, 92, 98, 103, 107, 108, 112, 115, 122, 123, 127, 128, 135, 138, 140, 147, 160, 162, 163, 167, 168, 172, 175, 178, 183, 188, 192, 200, 202, 203, 207, 210 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 3 ].`
	REFERENCES	`H. Cohn, A second course in number theory, John Wiley & Sons, Inc., New York-London, 1962. see page 3.`
	FORMULA	`List contains 0 and all positive n such that 2*A035170(n)=A028586(n) is nonzero. - Michael Somos Oct 21 2006`
	CROSSREFS	`Cf. A028927.` `Sequence in context: A088340 A047532 A028808 this_sequence A051468 A002274 A102664` `Adjacent sequences: A029715 A029716 A029717 this_sequence A029719 A029720 A029721`
	KEYWORD	`nonn`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from Larry Reeves (larryr(AT)acm.org), Mar 29 2000`

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Last modified December 4 12:27 EST 2008. Contains 151280 sequences.

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