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.
Project Euler: Problem 10, Sum of Primes
Back to basics 8 - Matrix Diagonals
Getting the indices from a vector
Add two numbers
Create matrix of replicated elements
kmph to mph converter
Create a constant offset.
Roots of a quadratic equation.
Energy of an object
Display negative numbers
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