Not really my solution... just a slightly cheating version of @bmtran's.
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 5, Smallest multiple
Spot the outlier
Vectorize the digits of an Integer
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Back to basics 18 - justification
Back to basics 17 - white space
Back to basics 14 - Keywords
Back to basics 11 - Max Integer
Back to basics 15 - classes
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