A005870 Numbers represented by hexagonal close-packing. (Formerly M2516)

0, 3, 6, 8, 9, 11, 12, 15, 17, 18, 19, 20, 21, 22, 25, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 41, 43, 44, 45, 46, 47, 48, 49, 51, 53, 54, 55, 56, 57, 59, 61, 63, 65, 66, 67, 68, 69, 70, 71, 72, 75

Offset

1,2

Comments

Numbers n such that A004012(n) != 0. - Sean A. Irvine, Sep 23 2016

References

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 114.

S. E. Thiel, Generating Functions for Fibonomial Coefficients and Fibonacci Products, http://stuartthiel.homestead.com/files/fibonacci/THIEL_fibonomial_coefficients_rev110612.pdf [Broken link?]

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..52.

Crossrefs

Cf. A004012.

Sequence in context: A280272 A190234 A036558 * A194461 A186385 A335155

Adjacent sequences: A005867 A005868 A005869 * A005871 A005872 A005873

Keyword

easy,nonn

Author

N. J. A. Sloane.

Status

approved