Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Encode Roman Numerals
Find common elements in matrix rows
Project Euler: Problem 4, Palindromic numbers
Project Euler: Problem 7, Nth prime
Spot the outlier
Locate a family on a long street
Solve an ODE: diffusion problem 2
Construct a prime circle
Compute a row of the Kimberling shuffle
Solve an ODE: equation A
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