Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Swap the input arguments
Number of Circles in a Number
Back to basics 12 - Input Arguments
Integer sequence - 2 : Kolakoski sequence
generate number in particular way
Solve an ODE: equation for a 2D laminar jet
Compute the Euler totient function
Compute home primes in a given base
Round up to π
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