Nice test cases!
With a more robust Test Suite many/most of the submissions would fail for ignoring the Problem Statement instruction that primes must be less than n. Please add test cases in which the input x (or "n") is itself a prime.
Return unique values without sorting
01 - Scalar variables
Area of a circle
Matlab Basics II - Extract last 3 elements of a vector
Sum the squares of numbers from 1 to n
Energy of an object
Sum of cubes
Roots of a quadratic equation.
Linear system of equations
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