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.
Return the Fibonacci Sequence
Back to basics 25 - Valid variable names
Split a string into chunks of specified length
Put Two 1D matrices into one 1D matrix
Is this triangle right-angled?
Generalized Laguerre polynomials
Edges of a n-dimensional Hypercube
Chebyshev polynomials of the 2nd Kind
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