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.
7 segment LED display
Scoring for oriented dominoes
Create an n-by-n null matrix and fill with ones certain positions
07 - Common functions and indexing 1
Side of an equilateral triangle
Generalized Laguerre polynomials
Chebyshev polynomials of the 1st Kind
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