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.
Implement a ROT13 cipher
Try 1.5.4: Celsius to Fahrenheit
Calculate the derivative of a polynomial
Create an index-powered vector
Triangular Tiling Dots in a Circle
Generalized Laguerre polynomials
Dots in a Sphere
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