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.
Find the alphabetic word product
Solve the Sudoku Row
Is it an Armstrong number?
Calculate volume of box
Sum of cubes
kmph to mph converter
Energy of an object
Roots of a quadratic equation.
Linear system of equations
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