id:A055040 - OEIS Search Results

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Numbers of the form 3^(2i+1)*(3*j+2).

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6, 15, 24, 33, 42, 51, 54, 60, 69, 78, 87, 96, 105, 114, 123, 132, 135, 141, 150, 159, 168, 177, 186, 195, 204, 213, 216, 222, 231, 240, 249, 258, 267, 276, 285, 294, 297, 303, 312, 321, 330, 339, 348, 357, 366, 375, 378, 384, 393, 402, 411 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Numbers not of the form x^2+y^2+3z^2.`
	REFERENCES	`L. J. Mordell, A new Waring's problem with squares of linear forms, Quart. J. Math., 1 (1930), 276-288 (see p. 283).`
	FORMULA	`G.f.: [x(x+2)(x^2+x+1)(x^7+x^3+1)]/(x^11-x^10-x+1) (conjectured).`
	CROSSREFS	`Equals 3*A055048(n).` `Sequence in context: A095032 A161925 A043477 this_sequence A017233 A122709 A052220` `Adjacent sequences: A055037 A055038 A055039 this_sequence A055041 A055042 A055043`
	KEYWORD	`nonn,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jun 01 2000`

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

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