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.
The Hitchhiker's Guide to MATLAB
Back to basics 26 - Keywords
Find the dimensions of a matrix
Divide by 4
Create a constant offset.
kmph to mph converter
Display negative numbers
Sum of cubes
Linear system of equations
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