Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Connect Four Win Checker
Return unique values without sorting
Mysterious digits operation (easy)
Sphenic number sequence
Pi Digit Probability
Count the ways to draw non-intersecting chords between points on a circle
Investigate the frequency of last digits of prime numbers
List the Moran numbers
Determine when snow started
Guess the card in Fitch Cheney’s five-card trick
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