Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
Remove all the words that end with "ain"
Distance walked 2D
Triangle Numbers Below N
Make a Star Pyramid
Hexagonal Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
Dots in a Diamond
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