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.
Sorted highest to lowest?
Back to basics 11 - Max Integer
Simple equation: Annual salary
Create a constant offset.
Roots of a quadratic equation.
Sum of cubes
Determine the roots of a cubic equation
Display negative numbers
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