Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Knight's Tour Checker
Spot the outlier
How many trades represent all the profit?
Sophie Germain prime
Find the Area of a Polygon
Evaluate the gamma function
Construct dimensionless parameters
Determine whether a number is a cluster prime
List the emirps
Play Outside In with primes
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