Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Find relatively common elements in matrix rows
Indexed Probability Table
Counting in Finnish
Sum of first n terms of a harmonic progression
Count alternating permutations
Identify prime words
Compute expulsions from the Kimberling shuffle
Compute the nth term from the Sieve of Flavius Josephus
Solve the arithmetic differential equation D(n) = n
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