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.
Back to basics 8 - Matrix Diagonals
Find nearest prime number less than input number
Add two numbers
Create an index-powered vector
Dots in a Sphere
Chebyshev polynomials of the 2nd Kind
Generalized Laguerre polynomials
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