#include <stdio.h>
#include <stdlib.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;
    for(i = 1; i <= T; i++)
    {
        c = 0;
        fscanf(fin, "%d", &N);
        for(x = 2; x < N/2; x++)
        {
            SUS = (2*N - x*(x-1));
            JOS = (2*x);
            if(SUS % JOS == 0)
            {
                k = SUS / JOS;
                c++;
                //fprintf(fout, "%d %d\n", k, k+x-1);
                aS[c] = k;
                aD[c] = k+x-1;
            }
            if(k <= 1)
                break;
        }
        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;
}