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.
1066 Solvers
3168 Solvers
Magic is simple (for beginners)
3224 Solvers
Compute LOG(1+X) in natural log
208 Solvers
249 Solvers
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