What it not printing hashes?

Actually this is a quiz from frist week of cs50 course. I guess I wrote the code correctly!

#include <stdio.h>
#include <cs50.h>

int main(void)
{
    int n;
    n = get_int("Enter a number: ");

    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            printf("#");
        }
        printf("/n");
    }};

};

output should be:

#
##
###
####
and so on...

I don't know what is wrong with my code. can anyone help please.