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
Back to basics 3 - Temp Directory
Number of 1s in a binary string
Find the biggest empty box
nth Rational Number
Volume of a Simplex
Edges of a n-dimensional Hypercube
Chebyshev polynomials of the 1st Kind
Shifted Hexagonal Tiling Dots in a Circle
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