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!
Eight Queens Solution Checker
Numbers with prime factors 2, 3 and 5.
intersection of matrices
Dots in a Circle
Volume of a Simplex
Radial Zernike polynomials
Dots in a Diamond
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