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.
Factorize THIS, buddy
Back to basics 5 - Clipboard
Try 1.5.4: Celsius to Fahrenheit
Check that number is whole number
Triangular Tiling Dots in a Circle
Chebyshev polynomials of the 1st Kind
Dots in a Circle
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