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.
Finding Perfect Squares
Set the array elements whose value is 13 to 0
Fibonacci-Sum of Squares
Find numbers in the Popular Computing Z-sequence
Compute the largest number possible with the Brussels choice
Count trailing zeros in a primorial
Find the nth term in the digit inventory sequence
Determine digits of the Copeland-Erdos constant
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