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.
All your base are belong to us
Angle between two vectors
Unique values without using UNIQUE function
Convert Two Character String into a Binary Vector
Dots in a Diamond
Volume of a Simplex
Dots in a Sphere
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