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.
Given an unsigned integer x, find the largest y by rearranging the bits in x
How to subtract?
Replace multiples of 5 with NaN
Find the nearest integer
Linear system of equations
Roots of a quadratic equation.
Sum of cubes
kmph to mph converter
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