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.
Specific Element Count
Back to basics 22 - Rotate a matrix
Matrix indexing with two vectors of indices
Sum of odd numbers in a matrix
Energy of an object
kmph to mph converter
Display negative numbers
Create a constant offset.
Linear system of equations
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