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
Factorize THIS, buddy
Back to basics 11 - Max Integer
Without the French accent please!
Return 'on' or 'off'
Chebyshev polynomials of the 1st Kind
Chebyshev polynomials of the 2nd Kind
Generalized Laguerre polynomials
Radial Zernike polynomials
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