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.
Determine whether a vector is monotonically increasing
07 - Common functions and indexing 5
Back to basics - mean of corner elements of a matrix
Sum the 'edge' values of a matrix
Matlab Basics II - squares
Linear system of equations
kmph to mph converter
Determine the roots of a cubic equation
Sum of cubes
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