This problem was fun. I was able to find a better way to solve beat my own solution. Not the best way though. But lot better.
Find the numeric mean of the prime numbers in a matrix.
Encode Roman Numerals
Convert a vector into a number
Make a run-length companion vector
Given a 4x4 matrix, swap the two middle columns
Sum of series I
Sum of series VII
Sum of series IV
Sum of series II
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