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 4 - Search Path
Celsius to Kelvin
Return area of square
Determine the roots of a cubic equation
Linear system of equations
Sum of cubes
kmph to mph converter
Energy of an object
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