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 two most distant points
Sum the elements in either diagonal of a square matrix
Generate a NaN...on purpose
Find out total non zero element of matrix
Create a constant offset.
Determine the roots of a cubic equation
Sum of cubes
Linear system of equations
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