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A097634 Numbers not of form x^2 + 2y^2 + 2yz + 4z^2. 2
7, 10, 21, 35, 42, 70, 79, 84, 91, 119, 133, 140, 168, 182, 189, 217, 231, 238, 259, 266, 280, 287, 315, 329, 336, 343, 364, 378, 385, 413, 427, 434, 462, 476, 483, 490, 511, 525, 532, 560, 574, 581, 609, 623, 630, 658, 672, 679, 707, 721, 728, 756, 770, 777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

t = Union[ Flatten[ Table[ x^2 + 2y^2 + 2y*z + 4z^2, {x, 0, 28}, {y, -23, 23}, {z, -16, 16}]]]; Complement[ Range[ 800], Take[t, 747]] (* Robert G. Wilson v, Aug 21 2004 *)

CROSSREFS

Complement of A000398.

Cf. A306469.

Sequence in context: A249942 A300021 A327977 * A120312 A074377 A103119

Adjacent sequences:  A097631 A097632 A097633 * A097635 A097636 A097637

KEYWORD

nonn

AUTHOR

Ralf Stephan, Aug 20 2004

EXTENSIONS

More terms from Robert G. Wilson v, Aug 21 2004

STATUS

approved

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Last modified July 28 07:33 EDT 2021. Contains 346320 sequences. (Running on oeis4.)