The test case result for n=5 seems a tad high.
Tim, that last case is altperm(altperm(5)). I did that to discourage lookup solutions.
Implement a ROT13 cipher
Energy of a photon
Back to basics 22 - Rotate a matrix
Flip the main diagonal of a matrix
Sum the elements in either diagonal of a square matrix
Compute the Euler totient function
Identify eban numbers
Compute expulsions from the Kimberling shuffle
Evaluate the prime zeta function
Test the generalized Legendre conjecture
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