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.
Encode Roman Numerals
Is my wife right?
Project Euler: Problem 9, Pythagorean numbers
Back to basics 22 - Rotate a matrix
Radial Zernike polynomials
Dots in a Circle
Dots in a Sphere
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