Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Find the alphabetic word product
Spherical radius given four points
Reverse the elements of an array
Narcissistic number ?
Decrypt the cypher using XOR encryption (for beginners)
Determine the Zeckendorf expansion of a number
Find jumping medalists
Determine whether a number is a cluster prime
Find pairs of primes with the same digit sum
Compute a sum of Ramanujan
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