Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Word Counting and Indexing
Check to see if a Sudoku Puzzle is Solved
surface of a spherical planet
Sophie Germain prime
Periodic Table 101.
Count trailing zeros in a primorial
Find terms in the Connell sequence
Evaluate the prime zeta function
Create a sequence of primes p such that p > n π(p)
Count the ways pairs of parentheses can be matched correctly
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