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.
Find the two-word state names
Alphabetize by last name
Indexed Probability Table
Getting the row and column location from a matrix
Change the sign of even index entries of the reversed vector
Dots in a Circle
Triangular Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
Volume of a Simplex
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