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.
Make a checkerboard matrix
Indexed Probability Table
Check to see if a Sudoku Puzzle is Solved
Set a diagonal
2倍してみよう - ここからスタート！
Radial Zernike polynomials
Generalized Laguerre polynomials
Volume of a Simplex
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