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.
Twins in a Window
Back to basics 1 - Saving
Create a square matrix of multiples
List the emirps
Determine whether a number is a cluster prime
Solve an ODE: equation B
Deduce the pattern behind the sequence
Find integer solutions to an equation with a sum of binomial coefficients
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