Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Remove the vowels
letter yes yes & letter no no
Add two numbers
Draw a 'X'!
Solve an ODE: equation for a 2D laminar jet
List the good primes
Determine digits of the Copeland-Erdos constant
Compute Khinchin's constant
Find the smallest prime with n inside
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