#include <fstream>
using namespace std;
int v[10000];
int main()
{
    int t,i,n,j,k,c,q;
    long long s;
    ifstream in("consecutive.in");
    ofstream out("consecutive.out");
    in>>t;
    s=0;
    c=0;
    q=1;
    for(i=1;i<=t;i++)
    {
        in>>n;
        for(j=1;j<=n;j++)
        {
            s=0;
            for(k=j;k<=n/2+1;k++)
            {
                s=s+k;
                if(s==n)
                {
                    v[q]=j;
                    v[q+1]=k;
                    q=q+2;
                    c++;
                    s=0;
                    break;
                }
            }
        }
        out<<c<<endl;
        for(j=1;j<=q-2;j=j+2)
        {
            out<<v[j]<<" "<<v[j+1]<<endl;
        }
    }
    return 0;
}