import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.LinkedList;
class Pair {
	int x,y;
	public Pair(int x,int y) {
		this.x = x;
		this.y = y;
	}
	public String toString() {
		return x + " " + y;
	}
}
public class Consecutive {
	int t;
	ArrayList<Integer> array;

	public void citire() throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("consecutive.in"));
		String line = null;
		line = br.readLine();
		array = new ArrayList<Integer>();
		t = Integer.parseInt(line);
		while ((line = br.readLine()) != null) {
			array.add(Integer.parseInt(line));
		}
		br.close();
	}

	public void solve() throws IOException {
		int solvings;
		ArrayList<Pair> pairs = new ArrayList<Pair>();
		PrintWriter writer = new PrintWriter(new FileWriter("consecutive.out"));
		for (Integer nr : array) {
			solvings = 0;
			LinkedList<Integer> coada = new LinkedList<Integer>();
			int cons = 1;
			coada.add(1);
			int suma = 1;
			while (coada.size() != 1 || coada.peek() == 1) {
				if (suma == nr) {
					pairs.add(new Pair(coada.getFirst(),coada.getLast()));
					solvings++;
					cons++;
					coada.add(cons);
					suma +=cons;
				} else {
					if (suma > nr) {
						suma -= coada.remove();
					} else {
						cons++;
						coada.add(cons);
						suma += cons;
					}
				}
			}
			writer.println(solvings);
		}
		for(Pair pair : pairs) {
			writer.println(pair);
		}
		writer.close();
	}

	public static void main(String args[]) throws IOException {
		Consecutive obj = new Consecutive();
		obj.citire();
		obj.solve();
	}
}