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.
Summing Digits within Text
First N Perfect Squares
Basic electricity in a dry situation
Infinite precision division
Approximation of Pi
Eliminate redundant numbers in text
Compute the date of a special marriage milestone
Compute the nth term from the golden sieve
Evaluate the prime zeta function
Identify primorial primes
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