LA 4340

#include<bits/stdc++.h>
using namespace std;

typedef unsigned long long int  ull;
typedef long long int      ll;
typedef vector<int>        vi;
typedef vector<ll>         vll;
typedef vector<vi>         vvi;
typedef pair<int,int >     pii;
typedef vector< pii >      vpii;
typedef set<int>           sti;

#define sc                 scanf
#define pf                 printf
#define sci(n)             scanf("%d",&n)
#define scl(n)             scanf("%lld",&n)
#define scd(n)             scanf("%lf",&n)
#define scs(s)             scanf("%s",s)
#define pfi(n)             printf("%d",n)
#define pfl(n)             printf("%lld",n)
#define pff(n)             cout<<n
#define line               printf("\n")
#define spc                printf(" ")
#define loop(i,x,y)        for(int i=int(x); i<=int(y); i++)
#define rloop(i,y,x)       for(int i=int(y); i>=int(x); i--)
#define cspf(i)            printf("Case %d: ", i)
#define pb                 push_back
#define mp                 make_pair
#define ff                 first
#define ss                 second
#define all(v)             v.begin(),v.end()
#define rall(v)            v.rbegin(),v.rend()
#define clr(arr,val)       memset(arr,val,sizeof arr);
#define read()             freopen("input.txt", "r", stdin)
#define write()            freopen("output.txt", "w", stdout)
/// Constants
#define eps                1e-9
#define PI                 acos(-1.0)  // 3.1415926535897932
#define MAX                1000007

bool chk[10009];
bool factp[10009];
void seive()
{
    clr(chk,0);
    chk[0]=1;
    chk[1]=1;
    for(int i=2;i<10005;i++){
        if(chk[i]) continue;
        for(int j=2;i*j<10005;j++){
            chk[i*j]=1;
        }
    }
}

void factcnt()
{
    clr(factp,0);
    factp[0]=0;
    factp[1]=0;
    for(int i=2;i<=10002;i++){
        int cnt=0;
        for(int j=1;j*j<=i;j++){
            if(i%j==0){
                cnt+=2;
                if(i/j==j) cnt--;
            }
        }
        if(!chk[cnt]){
            factp[i]=1;
        }
        else factp[i]=0;
    }
}

int main(){
    read();
    write();
    //ios_base::sync_with_stdio(false);
    //cin.tie(NULL);
    seive();
    factcnt();
    int n;
    cin>>n;
    while(n--){
        int l,h;
        cin>>l>>h;
        bool flg=0;
        for(int i=l;i<=h;i++){
            if(factp[i]==1){
                if(flg) spc;
                flg=1;
                cout<<i;
            }
        }
        if(!flg) cout<<-1;
        line;
    }
    return 0;
}