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.
Project Euler: Problem 1, Multiples of 3 and 5
vectorization in N
Formatting currency numbers
Radial Zernike polynomials
Chebyshev polynomials of the 2nd Kind
Shifted Hexagonal Tiling Dots in a Circle
Dots in a Sphere
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