If input must ber an integer n>=3, why in the test suite there are n=1 and n=2 cases?
test case for x=5 is wrong: swap 17 and 18.
Replace NaNs with the number that appears to its left in the row.
Prime factor digits
Back to basics 21 - Matrix replicating
Determine if input is a Narcissistic number
Center of mass
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