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.
Eight Queens Solution Checker
Better bullseye matrix
Solve the set of simultaneous linear equations
Flip the main diagonal of a matrix
Spherical radius given four points
Volume of a Simplex
Chebyshev polynomials of the 1st Kind
Triangular Tiling Dots in a Circle
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