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.
Find common elements in matrix rows
Numbers with prime factors 2, 3 and 5.
Reindex a vector
Large Sum (inspired by Project Euler 13)
Pick the die most likely to win
Solve a ballot counting problem
Find the last non-zero digit in a primorial
Iterate the sum of divisors and totient
Find numbers in the Popular Computing Z-sequence
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