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).
Back and Forth Rows
Are you in or are you out?
Return the Fibonacci Sequence
Sum of first n terms of a harmonic progression
Equal to their cube
BLOCK x3 (Version 1)
Divisors for big integer
I want to know everything!
Find the path through the cell
Find indices of diagonal elements
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