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!
Extract leading non-zero digit
Alphabetize by last name
Omit columns averages from a matrix
Back to basics 3 - Temp Directory
Triangular Tiling Dots in a Circle
Hexagonal Tiling Dots in a Circle
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