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.
The Tower of Hanoi
pressure to dB?
Matrix with different incremental runs
Given a matrix, swap the 2nd & 3rd columns
Dots in a Sphere
Triangular Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
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