Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
DNA N-Gram Distribution
Convert Roman to Arabic Numerals
"Low : High - Low : High - Turn around " -- Create a subindices vector
Determine if input is a perfect number
Find the last non-zero digit in a primorial
Compute home primes in a given base
Label primes with the Erdos-Selfridge classification
Compute the perimeter of an ellipse
Set Soldner's constant
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