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!
Sum all integers from 1 to 2^n
Project Euler: Problem 6, Natural numbers, squares and sums.
Find the biggest empty box
03 - Matrix Variables 4
Generalized Laguerre polynomials
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