Kissing number for $\mathbb{R}^{21}$
The maximum number of non-overlapping unit spheres that can touch a central unit sphere in $\mathbb{R}^{21}$.
Lower bound:
$29768$
(29,768)
Upper bound:
$53524$
(53,524)
Updates
-
Lower bound: $29768$
(29,768)
Reference unknown
[via Kissing number - Wikipedia] -
Upper bound: $53524$
(53,524)
Reference unknown
[via Kissing number - Wikipedia]