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.
Reverse Run-Length Encoder
Number of 1s in the Binary Representation of a Number
Rotate input square matrix 90 degrees CCW without rot90
BASICS - sum part of vector
Roots of a quadratic equation.
Create a constant offset.
Display negative numbers
Determine the roots of a cubic equation
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