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.
Remove all the consonants
Distance walked 2D
Project Euler: Problem 16, Sums of Digits of Powers of Two
Compute a dot product of two vectors x and y
Chebyshev polynomials of the 1st Kind
Dots in a Circle
Dots in a Sphere
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