Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Test for balanced parentheses
Project Euler: Problem 5, Smallest multiple
Project Euler: Problem 6, Natural numbers, squares and sums.
Magic is simple (for beginners)
Infinite precision division
Count numbers whose reciprocals' decimal expansions terminate
Solve a ballot counting problem
Compute an integral of an exponential function
Find numbers in the Popular Computing Z-sequence
Sum the elements in rows of the Levine triangle
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