#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream in ("consecutive.in");
ofstream out ("consecutive.out");
int n;
int m;
vector <pair<int, int> > f;
void Read()
{
	in>>m;
}
void Solve()
{
    in>>n;
	int S=0;
	for(int s=1;s<n;s++)
	{
		S+=s;
		int k=(n-S)/(s+1);
		if((s+1)*k+S==n&&k>=1)
		{
			f.push_back(make_pair(k,k+s));
		}
	}
}
void Afisare()
{
	out<<f.size()<<'\n';
	for(int i=0;i<f.size();i++)
	{
		out<<f[i].first<<' '<<f[i].second<<'\n';
	}
}
int main()
{
	Read();
    for(int i=0;i<m;i++)
    {
        Solve();
        Afisare();
    }
	return 0;
}