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 11 - Max Integer
Check if number exists in vector
04 - Scalar Equations 2
Cumulative product of a vector
Linear system of equations
Sum of cubes
Create a constant offset.
Roots of a quadratic equation.
Determine the roots of a cubic equation
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