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# Let $n$ be a positive integer and let $k$ be the number of positive integers less than $2^n$ that are invertible modulo $2^n$. If $2^n\equiv +1 304 1 +376 Let$n$be a positive integer and let$k$be the number of positive integers less than$2^n$that are invertible modulo$2^n$. If$2^n\equiv 3\pmod{13}$, then what is the remainder when$k$is divided by$13\$?

RektTheNoob  Aug 13, 2017
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