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.
Reverse Run-Length Encoder
Determine if input is a Narcissistic number
Find similar sequences
Determine digits of the Copeland-Erdos constant
Compute the fractional derivative
Identify Wagstaff primes
Generate a list of composite numbers
Compute the nth term from the golden sieve
Count the primes in Collatz sequences
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