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).
Who Has the Most Change?
Project Euler: Problem 2, Sum of even Fibonacci
Divisible by 5
Find indices of diagonal elements
Rank of magic square (for beginners)
BLOCK x3 (Version 1)
How to reverse spdiags?
Find Missing Number
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