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.
Finding Perfect Squares
Get the area codes from a list of phone numbers
Inner product of two vectors
Convert hex color specification to MATLAB RGB
Derivative of polynomial
Chebyshev polynomials of the 2nd Kind
Volume of a Simplex
Radial Zernike polynomials
Edges of a n-dimensional Hypercube
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