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.
Count from 0 to N^M in base N.
Project Euler: Problem 8, Find largest product in a large string of numbers
Find the stride of the longest skip sequence
Dots in a Sphere
Solve an ODE: separable equation
Evaluate the generalized hypergeometric function
Compute an integral of an exponential function
Investigate the frequency of last non-zero digits of primorials
Compute the date of a special marriage milestone
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