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A029596 Numbers represented by quadratic form with Gram matrix [ 4, 2, 2; 2, 4, 1; 2, 1, 6 ], divided by 2. 0
0, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18, 21, 22, 23, 24, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 78, 81, 82, 83, 84, 86, 87 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..72.

G. Nebe and N. J. A. Sloane, Home page for this lattice

MAPLE

L := [seq(0, i=1..1)]: for x from -20 to 20 do for y from -20 to 20 do for z from -20 to 20 do if member(4*x^2+4*x*y+4*x*z+4*y^2+2*y*z+6*z^2, L)=false then L := [op(L), 4*x^2 +4*x*y+4*x*z+4*y^2+2*y*z+6*z^2] fi: od: od: od: L2 := sort(L): for i from 1 to 100 do printf(`%d, `, L2[i]/2) od:

CROSSREFS

Sequence in context: A285126 A187388 A232012 * A039160 A175439 A048264

Adjacent sequences:  A029593 A029594 A029595 * A029597 A029598 A029599

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from James A. Sellers, May 31 2000

STATUS

approved

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Last modified December 8 08:31 EST 2021. Contains 349594 sequences. (Running on oeis4.)