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.
Back to basics 6 - Column Vector
Sum of diagonal of a square matrix
Generate a NaN...on purpose
Matlab Basics II - Minimum
Area of a circle
Display negative numbers
Determine the roots of a cubic equation
Roots of a quadratic equation.
Energy of an object
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