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 common elements in matrix rows
Vectorize the digits of an Integer
Given a window, how many subsets of a vector sum positive
Basics: 'Find the eigenvalues of given matrix
Product of Array
Create a constant offset.
Determine the roots of a cubic equation
Linear system of equations
Energy of an object
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