The kissing number problem

The kissing number has no overlapping spheres. A kissing number is defined as the independent sphere which is touched. In lattice packing, the kissing number is the same, but arbitrary sphere packing is different because of the random shape of spheres. It is the maximum possible kissing number for n-dimensional spheres in (n + 1)-dimensional Euclidean space.

In one dimension, the kissing number is 2 .
In two dimensions, the kissing number is 6.
This is isosceles.
D=1　⇒ 2

D=2　⇒ 6

D=3　⇒ 12

D=4　⇒ 24

D=5　⇒ 40
This is like exponential function.

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