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A028929
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Numbers represented by quadratic form with Gram matrix [ 4, 1; 1, 6 ], divided by 2.
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1
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0, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 24, 26, 27, 29, 31, 32, 36, 39, 41, 46, 47, 48, 50, 52, 54, 58, 62, 64, 69, 71, 72, 73, 75, 78, 81, 82, 87, 92, 93, 94, 96, 98, 100, 104, 108, 116, 117, 118, 123, 124, 127, 128, 131, 138, 139, 141, 142, 144, 146, 147, 150, 151, 156
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(x, y) = 4x^2 + 2xy + 6y^2; x=i/2 for all integers i; y = j/2, j an even integer if i even, j any integer if i odd.
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CROSSREFS
| Sequence in context: A071403 A010407 A035240 * A018731 A113961 A116621
Adjacent sequences: A028926 A028927 A028928 * A028930 A028931 A028932
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Corrected and extended by Larry Reeves (larryr(AT)acm.org), Mar 29 2000
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