What is this digit operation?
0 -> 0 1 -> 9 121 -> 9 44 -> 6 15 -> 5 1243 -> 7 ...
Solution Stats
Problem Comments
Recent Solvers68
Suggested Problems
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2394 Solvers
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Return the 3n+1 sequence for n
4957 Solvers
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13284 Solvers
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Matrix with different incremental runs
176 Solvers
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Permute diagonal and antidiagonal
166 Solvers
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