#include <iostream>
#include <fstream>
#include <vector> 

using namespace std;

ifstream fin("consecutive.in");
ofstream fout("consecutive.out");

int n, t;
vector <pair <int, int> > v;

int main() {
	fin >> t;
	for (int i = 0; i < t; ++i) {
		fin >> n;
		for (int j = 1; j < (n / 2) + 2; ++j) {
			for (int k = j + 1; k < (n / 2) + 3; ++k) {
				int sum = (k + j) * (k - j + 1) / 2;
				if (sum == n) {
					v.push_back(make_pair(j, k));
				}
			}
			//sum = (m + n) * (m - n  + 1) / 2;
		}
	}
	fout << v.size() << '\n';
	for (int i = 0; i < v.size(); ++i) {
		fout << v[i].first <<' '<< v[i].second << '\n';
	}
	return 0;
}