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.
Determine if input is a perfect number
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Number of odd and even elements within matrix
A matrix of extroverts
Dots in a Circle
Volume of a Simplex
Edges of a n-dimensional Hypercube
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