#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
    int T, N;
    FILE *fin = fopen("consecutive.in", "r");
    FILE *fout = fopen("consecutive.out", "w");
    fscanf(fin, "%d", &T);
    int aS[100000];
    int aD[100000];

    int i, x, SUS, JOS;
    int k, c;
    float cond;
    for(i = 1; i <= T; i++)
    {
        c = 0;
        fscanf(fin, "%d", &N);

        x = 2;
        do
        {
            SUS = (2*N - x*x + x);
            JOS = (2*x);
            k = SUS / JOS;
            if(SUS % JOS == 0)
            {
                c++;
                aS[c] = k ;
                aD[c] = k+x-1;
            }
            //printf("%d  ", k);

            x++;
        }while(x <= 2*sqrt(N) && k >= 1);

        fprintf(fout, "%d\n",c);
        for(x = 1; x <= c; x++)
            fprintf(fout, "%d %d\n", aS[x], aD[x]);
    }

    fclose(fin);
    fclose(fout);
    return 0;
}