Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Sort a list of complex numbers based on far they are from the origin.
Determine if a Given Number is a Triangle Number
Project Euler: Problem 2, Sum of even Fibonacci
Spot the First Occurrence of 5
Find the nth term in the digit inventory sequence
Determine whether a square can be drawn on a grid of dots
Solve a ballot counting problem
Label primes with the Erdos-Selfridge classification
Generate a list of composite numbers
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