Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Determine if input is odd
We love vectorized solutions. Problem 1 : remove the row average.
Compute Fibonacci Number
Find similar sequences
Solve the Challenger puzzle
Evaluate the logarithmic integral
List the emirps
Eliminate redundant numbers in text
Determine whether a number is a prime self number
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