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.
Return the 3n+1 sequence for n
Reverse the Words (not letters) of a String
Column norms of a matrix
Find best placement for ordered dominoes (harder)
Dots in a Sphere
Chebyshev polynomials of the 1st Kind
Dots in a Diamond
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