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).
1743 Solvers
495 Solvers
Least common multiple of many numbers
189 Solvers
Remove the two elements next to NaN value
419 Solvers
Replace multiples of 5 with NaN
362 Solvers
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