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).
Remove any row in which a NaN appears
Project Euler: Problem 16, Sums of Digits of Powers of Two
Rotate and display numbered tile
Change the sign of even index entries of the reversed vector
Numbers spiral diagonals (Part 1)
I want to know everything!
Mirror, mirror on the wall, who is fairest of them all?
Negation and new variables
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