Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Finding Perfect Squares
How to find the position of an element in a vector without using the find function
Return unique values without sorting
Return elements unique to either input
Locate a family on a long street
Solve the arithmetic differential equation D(n) = n
Test the generalized Legendre conjecture
Find jumping medalists
Investigate the frequency of last digits of prime numbers
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