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.
Check if sorted
Set the array elements whose value is 13 to 0
sum of non-primes
Generate pi using logarithm
Shifted Hexagonal Tiling Dots in a Circle
Dots in a Circle
Edges of a n-dimensional Hypercube
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