Chris problems are kinda my favourite :)
Very nice problem
Sort a list of complex numbers based on far they are from the origin.
Replace NaNs with the number that appears to its left in the row.
All your base are belong to us
Find the stride of the longest skip sequence
Identify prime words
Construct dimensionless parameters
Identify Wagstaff primes
Label primes with the Erdos-Selfridge classification
Convert a number from base 10 to factorial notation
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