#include <fstream>
using namespace std;
ifstream fin("consecutive.in");
ofstream fout("consecutive.out");
struct aka{int aa;int kk;};
aka ak[199999999];
int nk,n,k,t,i,j;
float a;
int main()
{
    fin>>t;
    for(i=1;i<=t;i++)
    {
        fin>>n;
        for(k=2;k*(k+1)<=n;k++)
        {
            a=(n+k*(k-1))/(k*2);
            if(a==(int)a)
            {
               j++;
               ak[j].aa=a;
               ak[j].kk=k;
               nk++;
            }
        }
        fout<<nk<<'\n';
        for(k=1;k<=j;k++)
            fout<<ak[k].aa<<' '<<ak[k].aa+ak[k].kk-1<<'/n';
    }
    return 0;
}