#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
using P=pair<ll,ll>;
template<typename T>using minque=priority_queue<T,vector<T>,greater<T>>;
template<typename T>bool chmax(T &a,const T &b){return (a<b?(a=b,true):false);}
template<typename T>bool chmin(T &a,const T &b){return (a>b?(a=b,true):false);}
template<typename T1,typename T2>istream &operator>>(istream &is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}
template<typename T1,typename T2,typename T3>istream &operator>>(istream &is,tuple<T1,T2,T3>&a){is>>std::get<0>(a)>>std::get<1>(a)>>std::get<2>(a);return is;}
template<typename T,size_t n>istream &operator>>(istream &is,array<T,n>&a){for(auto&i:a)is>>i;return is;}
template<typename T>istream &operator>>(istream &is,vector<T> &a){for(auto &i:a)is>>i;return is;}
template<typename T1,typename T2>void operator++(pair<T1,T2>&a,int n){a.first++,a.second++;}
template<typename T1,typename T2>void operator--(pair<T1,T2>&a,int n){a.first--,a.second--;}
template<typename T>void operator++(vector<T>&a,int n){for(auto &i:a)i++;}
template<typename T>void operator--(vector<T>&a,int n){for(auto &i:a)i--;}
#define overload3(_1,_2,_3,name,...) name
#define rep1(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,l,r) for(int i=(int)(l);i<(int)(r);i++)
#define rep(...) overload3(__VA_ARGS__,rep2,rep1)(__VA_ARGS__)
#define reps(i,l,r) rep2(i,l,r)
#define all(x) x.begin(),x.end()
#define pcnt(x) __builtin_popcountll(x)
#define fin(x) return cout<<(x)<<'\n',static_cast<void>(0)
#define yn(x) cout<<((x)?"Yes\n":"No\n")
#define uniq(x) sort(all(x)),x.erase(unique(all(x)),x.end())
template<typename T>
inline int fkey(vector<T>&z,T key){return lower_bound(z.begin(),z.end(),key)-z.begin();}
ll myceil(ll a,ll b){return (a+b-1)/b;}
template<typename T,size_t n,size_t id=0>
auto vec(const int (&d)[n],const T &init=T()){
  if constexpr (id<n)return vector(d[id],vec<T,n,id+1>(d,init));
  else return init;
}
#ifdef LOCAL
#include<debug.h>
#else
#define debug(...) static_cast<void>(0)
#define debugg(...) static_cast<void>(0)
template<typename T1,typename T2>ostream &operator<<(ostream &os,const pair<T1,T2>&p){os<<p.first<<' '<<p.second;return os;}
#endif
struct Timer{
  clock_t start;
  Timer(){
    start=clock();
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout<<fixed<<setprecision(16);
  }
  inline double now(){return (double)(clock()-start)/1000;}
  #ifdef LOCAL
  ~Timer(){
    cerr<<"time:";
    cerr<<now();
    cerr<<"ms\n";
  }
  #endif
}timer;
void SOLVE();
int main(){
  int testcase=1;
  //cin>>testcase;
  for(int i=0;i<testcase;i++){
    SOLVE();
  }
}
std::vector<int>prime_sieve(int n){
  if(n<=6){
    if(n<=1)return std::vector<int>{};
    else if(n==2)return std::vector<int>{2};
    else if(n<=4)return std::vector<int>{2,3};
    else return std::vector<int>{2,3,5};
  }
  static constexpr int mod30table[8]={1,7,11,13,17,19,23,29};
  static constexpr uint8_t k_mask[][8] = {
    {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f},
    {0xfd, 0xdf, 0xef, 0xfe, 0x7f, 0xf7, 0xfb, 0xbf},
    {0xfb, 0xef, 0xfe, 0xbf, 0xfd, 0x7f, 0xf7, 0xdf},
    {0xf7, 0xfe, 0xbf, 0xdf, 0xfb, 0xfd, 0x7f, 0xef},
    {0xef, 0x7f, 0xfd, 0xfb, 0xdf, 0xbf, 0xfe, 0xf7},
    {0xdf, 0xf7, 0x7f, 0xfd, 0xbf, 0xfe, 0xef, 0xfb},
    {0xbf, 0xfb, 0xf7, 0x7f, 0xfe, 0xef, 0xdf, 0xfd},
    {0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0xfe},
  };
  static constexpr int c0[][8] = {
    {0, 0, 0, 0, 0, 0, 0, 1}, {1, 1, 1, 0, 1, 1, 1, 1},
    {2, 2, 0, 2, 0, 2, 2, 1}, {3, 1, 1, 2, 1, 1, 3, 1},
    {3, 3, 1, 2, 1, 3, 3, 1}, {4, 2, 2, 2, 2, 2, 4, 1},
    {5, 3, 1, 4, 1, 3, 5, 1}, {6, 4, 2, 4, 2, 4, 6, 1},
  };
  static constexpr int c1[8]={6,4,2,4,2,4,6,2};
  n++;
  int sz=(n+29)/30;
  std::vector<uint8_t>p(sz,0xff);
  {
    int r=n%30;
    if(r==0);
    else if(r==1)p.back()=0x00;
    else if(r<=7)p.back()=0x01;
    else if(r<=11)p.back()=0x03;
    else if(r<=13)p.back()=0x07;
    else if(r<=17)p.back()=0x0f;
    else if(r<=19)p.back()=0x1f;
    else if(r<=23)p.back()=0x3f;
    else if(r<=29)p.back()=0x7f;
  }
  p[0]=0xfe;
  int sq=((int)std::sqrt(n)+29)/30;
  for(int i=0;i<=sq;i++){
    for(uint8_t f=p[i];f>0;f=f&(f-1)){
      uint8_t l=__builtin_ctz(f);
      int m=mod30table[l];
      int pm=i*30+m*2;
      for(int j=i*pm+m*m/30,k=l;j<p.size();j+=i*c1[k]+c0[l][k],k=(k+1)&7){
        p[j]&=k_mask[l][k];
      }
    }
  }
  std::vector<int>res{2,3,5};
  for(int i=0;i<p.size()-1;i++){
    for(int j=p[i];j>0;j=j&(j-1))res.push_back(i*30+mod30table[__builtin_ctz(j)]);
  }
  for(int j=p.back();j>0;j=j&(j-1)){
    int l=__builtin_ctz(j);
    int k=(p.size()-1)*30+mod30table[l];
    if(k<n)res.push_back(k);
    else break;
  }
  return res;
}
void SOLVE(){
  int t;
  cin>>t;
  vector<ll>query(t);
  cin>>query;
  ll mx=*max_element(all(query));
  auto p=prime_sieve(sqrtl(mx)+50);
  vector<ll>ans;
  ans.reserve(p.size()+1);
  ans.push_back(-1);
  rep(i,(int)p.size()-1)if(p[i]+2==p[i+1])ans.push_back((ll)p[i]*p[i+1]);
  for(ll x:query)cout<<*prev(upper_bound(all(ans),x))<<'\n';
}