Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Find the two most distant points
Multiply 2 numbers
Unique values without using UNIQUE function
Determine if input is a Narcissistic number
List the good primes
Count numbers whose reciprocals' decimal expansions terminate
List the dihedral primes
Round up to π
Identify eban numbers
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