You're *very* close with this one. Remember that r is input as a double, not a string.
Check to see if a Sudoku Puzzle is Solved
Increment a number, given its digits
The number of trailing zero digit of a factorial
"Find out the best cricket"
Golomb's self-describing sequence (based on Euler 341)
Why the heck are they blinking!?!?
Sums of Distinct Powers
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