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The "x2" question

Description

Set function \(m(n) =\) move the last digit of n to the first digit.

For example:

\(m(126) = 612\)

\(m(2017) = 7201\)

(Sorry for my bad English cuz I'm not a native English speaker...)

 


Question

When \(m(n) = 2n\), what is the smallest value \(n\) could be? (note: \(n > 0\))


When \(m(n) = 2n\), what is the smallest value \(n\) could be? (note: \(n > 0\))