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.
Program an exclusive OR operation with logical operators
Back to basics 16 - byte order
Detect a number and replace with two NaN's
Radial Zernike polynomials
Shifted Hexagonal Tiling Dots in a Circle
Triangular Tiling Dots in a Circle
Chebyshev polynomials of the 1st Kind
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