Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Return the largest number that is adjacent to a zero
Sum of odd numbers in a matrix
Find the Area of a Polygon
Pi Digit Probability
Investigate the frequency of last non-zero digits of primorials
Determine digits of the Copeland-Erdos constant
Compute expulsions from the Kimberling shuffle
Play Outside In with primes
Construct finite difference approximations of derivatives
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