You're *very* close with this one. Remember that r is input as a double, not a string.
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Create a square matrix of multiples
Rotate a Matrix by 90 degrees
Set a diagonal
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Numbered lottery balls into cells
The Hills Are Alive...
What digit is it?
Hackathon - String version
Reindex a vector
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