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).
Prime factor digits
Column norms of a matrix
Getting the absolute index from a matrix
frame of the matrix
Divisors for big integer
Clear all empty variables from the workspace
Replicate elements in vectors
Rank of magic square (for beginners)
Getting the indices from a matrice
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