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A055048
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Numbers of the form 9^i*(3*j+2).
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1
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2, 5, 8, 11, 14, 17, 18, 20, 23, 26, 29, 32, 35, 38, 41, 44, 45, 47, 50, 53, 56, 59, 62, 65, 68, 71, 72, 74, 77, 80, 83, 86, 89, 92, 95, 98, 99, 101, 104, 107, 110, 113, 116, 119, 122, 125, 126, 128, 131, 134, 137, 140, 143, 146, 149, 152, 153, 155
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The numbers not of the form x^2+3y^2+3z^2.
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REFERENCES
| L. J. Mordell, A new Waring's problem with squares of linear forms, Quart. J. Math., 1 (1930), 276-288 (see p. 283).
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MATHEMATICA
| max = 200; Select[ Union[ Flatten[ Table[ 9^i*(3*j + 2), {i, 0, Ceiling[Log[max]/Log[9]]}, {j, 0, Ceiling[( max/9^i - 2)/3]}]]], # <= max &] (* From Jean-François Alcover, Oct 13 2011 *)
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CROSSREFS
| Cf. A055040.
Sequence in context: A022842 A189525 A189369 * A045930 A140099 A109232
Adjacent sequences: A055045 A055046 A055047 * A055049 A055050 A055051
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 01 2000
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