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.
Distance walked 1D
Set the array elements whose value is 13 to 0
Matlab Basics II - Max & Index of Max
Output a vector which is table of 9
MATLAB Basic: rounding IV
Linear system of equations
Sum of cubes
Create a constant offset.
Energy of an object
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