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!
Which doors are open?
Project Euler: Problem 3, Largest prime factor
First non-zero element in each column
Replace May with April
Longest run of consecutive numbers
Generalized Laguerre polynomials
Radial Zernike polynomials
Hexagonal Tiling Dots in a Circle
Shifted Hexagonal Tiling Dots in a Circle
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