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.
Determine Whether an array is empty
Sum the Digits of a Number
Compute Fibonacci Number
Solve an ODE: equidimensional equation
Determine whether a number is a prime self number
Investigate the frequency of last digits of prime numbers
Find the zeros of the Bessel function of the first kind
Evaluate the prime zeta function
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