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.
Divide by 4
Replace values under a limit
Test Problem; Create a 5x5 array containing all ones
Convert yards to feet
Linear system of equations
Create a constant offset.
kmph to mph converter
Energy of an object
Determine the roots of a cubic equation
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