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.
Make a 1 hot vector
The Answer to Life, the Universe, and Everything
Sum of series II
Chebyshev polynomials of the 2nd Kind
Generalized Laguerre polynomials
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