0,2

Radii of these circles are square roots of A202822.

Table of n, a(n) for n=0..68.

Szymon Lukaszyk, MATLAB script

Szymon Lukaszyk, A short note about the geometry of graphene, ResearchGate, (2020).

Szymon Lukaszyk, Illustration of the subsequent 36 radii around a hex center.

Cf. A202822, A338947 (similar but with circles centered at a vertex of one hexagon).

Sequence in context: A028317 A220435 A340512 * A055665 A168328 A176569

Adjacent sequences: A338989 A338990 A338991 * A338993 A338994 A338995

nonn

Szymon Lukaszyk, Nov 17 2020

approved