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.
Return the 3n+1 sequence for n
"Low : High - Low : High - Turn around " -- Create a subindices vector
Spot the outlier
Remove the two elements next to NaN value
Repeat middle rows and columns of an array
Generate a list of composite numbers
Evaluate the generalized hypergeometric function
Compute the nth Naerogahtyp emirp
Construct finite difference approximations of derivatives
Play Outside In with primes
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