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.
Convert String to Morse Code
letter yes yes & letter no no
Unique values without using UNIQUE function
A matrix of extroverts
Radial Zernike polynomials
Chebyshev polynomials of the 2nd Kind
Dots in a Sphere
Volume of a Simplex
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