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.
Back to basics 3 - Temp Directory
Specific Element Count
Is it a number?
Too Many Zeros, Dump Them!
Radial Zernike polynomials
Triangular Tiling Dots in a Circle
Dots in a Diamond
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