Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Spherical radius given four points
Multiply 2 numbers
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
How many Fibonacci numbers?
Compute the Euler totient function
Find pairs of primes with the same digit sum and a specified separation
Generate a list of composite numbers
Label primes with the Erdos-Selfridge classification
Compute Khinchin's constant
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