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!
First N Perfect Squares
Determine Whether an array is empty
03 - Matrix Variables 1
Sum of odd numbers in a matrix
Generalized Laguerre polynomials
Edges of a n-dimensional Hypercube
Radial Zernike polynomials
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