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.
Sum the Infinite Series
Check if number exists in vector
Golomb's self-describing sequence (based on Euler 341)
Big numbers, least significant digits
Divisible by 2
Find the last non-zero digit in a primorial
Solve an ODE: equation C
List the cuban primes
Solve a ballot counting problem
Test the generalized Legendre conjecture
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