A good opportunity to implement a hashtable: lots of collisions without it.
A re-post of Solution 1137054, because that one doesn't appear in the list of solutions, for some reason (I'm not sure why).
Factorize THIS, buddy
Find nearest prime number less than input number
Replace multiples of 5 with NaN
Add more zeros
Permute diagonal and antidiagonal
Chess ELO rating system
Find the path through the cell
BLOCK x3 (Version 3)
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