#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    cout << n - 1 << " \n";
    for (int i = 2; i <= n; ++i) cout << i << " ";
    cout << '\n';
  }
}
