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#include <bits/stdc++.h>
using namespace std;
ifstream fin("consecutive.in");
ofstream fout("consecutive.out");
int main()
{
int t;
fin >> t;
while (t--) {
long long s;
fin >> s;
vector <pair <long long, long long>> sol;
for (long long n = 2; n * n <= 2*s; n++) {
long long p = ((2 * s / n) - n + 1) / 2;
if ((2 * p + n - 1) * n / 2 == s) {
sol.push_back({p, p + n - 1});
}
}
fout << sol.size() << '\n';
for (auto it : sol) {
fout << it.first << ' ' << it.second << '\n';
}
}
return 0;
}