#include <iostream>
#include <math.h>
#include <vector>
#include <stdio.h>
using namespace std;

    FILE *g;
void afs(long n ){
//    unsigned long cnt = 0;

    vector<pair<long,long>> limite;
//    long limite[100][2];


    for(int i = 2; i <= 15; i++){
        float mij = (float)n / i;
        long first;
        long last;
        float rest = (mij - floor(mij));
        if ( i % 2 == 0 && rest == 0.5){
            first =  ceil(mij - ((float)i/2));
            last = floor(mij + ((float)i/2));
            if(first > 0) {
//             cout << first << " " << last << endl;
            limite.push_back(make_pair(first,last));
//             limite[cnt][0] = first;
//             limite[cnt][1] = last;
//             cnt ++;
            } else{
                break;
            }

        } else if(i % 2 != 0 && rest == 0.0){
            first = mij - (i/2);
            last = mij + (i/2);
            if(first > 0){
//                cout << first << " " << last << endl;
//                limite[cnt][0] = first;
//                limite[cnt][1] = last;
//
                    limite.push_back(make_pair(first,last));
//                cnt ++;
            } else{
                break;
            }
        }

    }
fprintf(g,"%d\n",limite.size());
//    cout << cnt << endl;

    for( auto &a : limite){

            fprintf(g,"%d %d\n",a.first, a.second);
    }

//    if(cnt!=0)
//    {
//        for(int i = 0; i < cnt; i++){
//            fprintf(g,"%d %d\n",limite[i][0], limite[i][1]);
////            cout << limite[i][0] << " " << limite[i][1] << endl;
//        }
//    }
}

int main()
{
    FILE *f = fopen("consecutive.in","r");
g = fopen("consecutive.out","w");

    int nrT;
    long n ;
    fscanf(f,"%d",&nrT);

    for(int i = 0; i < nrT; i++){
        fscanf(f, "%lu", &n);
        afs(n);
    }



    return 0;
}