Count the number of primes less than 'n'.
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.
Find the numeric mean of the prime numbers in a matrix.
Column norms of a matrix
Sum the numbers on the main diagonal
Create sequnce 1 4 9 16 25.........
Sum of cubes
Display negative numbers
Energy of an object
Determine the roots of a cubic equation
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