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.
Maximum running product for a string of numbers
Find the peak 3n+1 sequence value
pressure to dB?
Eight Queens Solution Checker
Back to basics 17 - white space
Shifted Hexagonal Tiling Dots in a Circle
Radial Zernike polynomials
Dots in a Sphere
Volume of a Simplex
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