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!
Better bullseye matrix
Cell Counting: How Many Draws?
Replace multiples of 5 with NaN
Try 1.5.4: Celsius to Fahrenheit
Dots in a Circle
Dots in a Diamond
Chebyshev polynomials of the 2nd Kind
Triangular Tiling Dots in a Circle
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