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A051658 Experimental values for maximal number of contacts between equal circles and the box that are packed into a square. 0
4, 5, 7, 12, 12, 13, 14, 20, 24, 21, 20, 25, 25, 32, 36, 40, 34, 38, 37, 44, 39, 43, 56, 56, 60, 56, 55, 57, 65, 65, 55, 63, 65, 80, 80, 84, 77, 77, 80, 85, 100, 90, 85, 82, 94, 91, 94, 111, 120, 100, 97, 105, 110, 115, 113, 119, 113 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

H. T. Croft, K. J. Falconer and R. K. Guy: Unsolved problems in geometry, Springer, New York, 1991.

LINKS

Table of n, a(n) for n=1..57.

D. Boll, Optimal Packing Of Circles And Spheres

E. Friedman, Erich's Packing Center

C. D. Maranas, C. A. Floudas and P. M. Pardalos, New results in the packing of equal circles in a square, Discrete Mathematics 142 (1995), p. 287-293.

K. J. Nurmela and P.R. J. Ostergard, Packing up to 50 equal circles in a square, Discrete Comput. Geom. 18 (1997) 1, p. 111-120.

E. Specht, www.packomania.com

CROSSREFS

Sequence in context: A242212 A129302 A216536 * A047491 A064401 A079337

Adjacent sequences:  A051655 A051656 A051657 * A051659 A051660 A051661

KEYWORD

nonn

AUTHOR

Eckard Specht (eckard.specht(AT)physik.uni-magdeburg.de)

EXTENSIONS

I do not know how many of these values have been rigorously proved - N. J. A. Sloane.

STATUS

approved

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Last modified September 17 16:57 EDT 2019. Contains 327136 sequences. (Running on oeis4.)