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.
Is this matrix orthogonal?
Whether the input is vector?
Determine if input is a perfect number
Evaluate the incomplete elliptic integrals
List the emirps
Determine digits of the Copeland-Erdos constant
Evaluate the logarithmic integral
Investigate the frequency of last digits of prime numbers
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