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.
Most nonzero elements in row
Reverse the vector
Max of a Vector
Sum of series III
Is it prime?
Energy of an object
kmph to mph converter
Roots of a quadratic equation.
Determine the roots of a cubic equation
Linear system of equations
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