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 15 - Benchmark
Determine Whether an array is empty
What's Your BMI?
Element by element multiplication of two vectors
Create a constant offset.
Energy of an object
kmph to mph converter
Roots of a quadratic equation.
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