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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
OFFSET
1,1
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: A300021 A363292 A327977 * A120312 A074377 A103119
KEYWORD
nonn
AUTHOR
Ralf Stephan, Aug 20 2004
EXTENSIONS
More terms from Robert G. Wilson v, Aug 21 2004
STATUS
approved