+0  
 
-1
25
1
avatar+721 

Find the numbers of integers $n$, $0 \le n \le 18$, such that $n$ has a multiplicative inverse modulo $19$.

 Aug 22, 2023
 #1
avatar+867 
0

The answers are 1, 2, 3, 6, 7, 10, 12, 14, 15, 17.

 Jul 2, 2024

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