Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Back to basics 11 - Max Integer
Spherical radius given four points
Find two triangular numbers whose sum is input.
Compute the sum of reciprocals of quadratics
Identify Ruth-Aaron numbers
Compute expulsions from the Kimberling shuffle
List the good primes
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