This problem is looking for the number of vertices on the hexagonal grid inside the circle of radius r. The center of the hexagon is not counted as a point for this problem, and this is true for every hexagon inside the circle.
Distance walked 3D
Whether the input is vector?
Set a diagonal
Insert zeros into vector
Shifted Hexagonal Tiling Dots in a Circle
Edges of a n-dimensional Hypercube
Chebyshev polynomials of the 1st Kind
Volume of a Simplex
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