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.
Return the first and last character of a string
Max index of 3D array
Estimate π from certain values of the zeta function
Evaluate the zeta function for complex arguments
Compute the harmonic numbers
Determine digits of the Copeland-Erdos constant
Determine whether a number is a cluster prime
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