#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t, n, i, j;
  cin >> t;
  while (t--) {
    cin >> n;
    cout << n << endl;
    for (i = 1; i <= n; i++) {
      cout << i << " ";
    }
    cout << endl;
  }
  return 0;
}
