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.
Make a checkerboard matrix
Return the 3n+1 sequence for n
Determine if a Given Number is a Triangle Number
letter yes yes & letter no no
Identify full reptend primes
Construct finite difference approximations of derivatives
Determine digits of the Copeland-Erdos constant
Compute the nth Pythagorean prime
Compute the date of a special marriage milestone
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