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.
Solve the Sudoku Row
Get the length of a given vector
find radius of cone
Integer or Float?
kmph to mph converter
Display negative numbers
Roots of a quadratic equation.
Sum of cubes
Create a constant offset.
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