Write a function to find the 5th root of a number.
It sounds easy, but the typical functions are not allowed (see the test suite), so you'll need to find a non-standard method to solve the problem.
subtract central cross
convert matrix to single column
Find the index of n in magic(n)
Parse me a Lisp
Rule of mixtures (composites) - lower bound
Lights Out 17 - 5x5, broken buttons III
Lights Out 9 - 5x5, light-only solution? II
Divisible by n, Truncated-number Divisors
Lights Out 4 - 5x5, 8 moves
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