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.
Extract leading non-zero digit
Replace NaNs with the number that appears to its left in the row.
Number of toolboxes?
Is A the inverse of B?
Triangular Tiling Dots in a Circle
Shifted Hexagonal Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
Dots in a Sphere
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