A036559 - OEIS

A036559

Squared distances that cannot arise in any Barlow packing of spheres of diameter sqrt(3) (the scale being the simplest one that makes this an integer sequence).

1, 2, 4, 5, 7, 10, 13, 14, 16, 23, 26, 28, 38, 40, 42, 52, 58, 64, 74, 90, 104, 106, 112, 122, 138, 154, 160, 168, 170, 186, 202, 208, 218, 230, 232, 234, 250, 256, 266, 282, 296, 298, 314, 330, 346, 360, 362, 378, 394, 410, 416, 424, 426, 442, 448

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

FORMULA

Conjectured to consist of 4^n times 1 or 7 or 13 or 16k+10 together with 2, 5, 14, 23, 38, 230.

CROSSREFS

Complement of A036558.

Sequence in context: A123120 A194462 A163267 * A083022 A279022 A376080

Adjacent sequences: A036556 A036557 A036558 * A036560 A036561 A036562

KEYWORD

nonn

AUTHOR

J. H. Conway, N. J. A. Sloane.

STATUS

approved