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.
Sort a list of complex numbers based on far they are from the origin.
Getting logical indexes
Is X a Fibonacci Matrix?
Vector of numbers divisible by 3
Sum of series II
Shifted Hexagonal Tiling Dots in a Circle
Dots in a Sphere
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