#include <bits/stdc++.h>
int main() {
  int T;
  scanf("%d", &T);
  while (T--) {
    int n;
    scanf("%d", &n);
    int A, B, C;
    scanf("%d%d", &A, &B);
    int id = -1;
    for (int i = 3; i <= n; i++) {
      scanf("%d", &C);
      if (A + B <= C)
        id = i;
      else {
        A = B;
        B = C;
      }
    }
    id == -1 ? printf("%d\n", id) : printf("%d %d %d\n", id - 2, id - 1, id);
  }
}
