Composite Numbers Having 7

//Bismillahir Rahmanir Rahim
/******Harun Or Rashid******/
/***********Template Starts Here***********/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<cctype>
#include<cstdlib>
#include<cassert>
#include<string>
#include<vector>
#include<set>
#include<stack>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;

#define MEM(a,b) memset(a,b,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)>(b)?(b):(a))
#define ABS(a) ((a)>0? (a):(-(a)))
#define SQ(a) ((a)*(a))
#define SZ(a) (int)a.size()
#define FORN(i,n) for(i=1;i<=n;i++)
#define FORAB(i,a,b) for(i=a;i<=b;i++)
#define ALL(V) V.begin(),V.end()
#define pb(a) push_back(a)
#define pr(a) cout<<a<<endl
#define SQR(a) ((a)*(a))
#define pf printf
#define sf scanf
#define swap(a,b) (a ^= b, b ^= a, a ^= b)
#define PI acos(-1)
#define x first
#define y second
#define eps 1e-7

typedef int D;
typedef long long int LLD;
typedef unsigned long long int LLU;
typedef vector<D> VI;
typedef set<D> SI;
typedef vector<D>::iterator Viti;

/***********Template Ends Here***********/

int main()
{
    int T,m,n,cnt;
    cin>>T;
    while(T--)
    {
        cin>>m>>n;
        bool prime[n+1];
        int i,j;
        memset(prime,true,sizeof prime);
        prime[0]=prime[1]=false;
        for(i=4; i<=n; i+=2) prime[i]=false;
        for(i=3; i*i<=n; i+=2)
            if(prime[i])
                for(j=i*i; j<=n; j+=i+i)
                    prime[j]=false;
        cnt=0;
        for(i=0; i<=n; i++)
            if(prime[i]==false)
                if(i>=m)
                {
                    int x=i;
                    while(x)
                    {
                        if(x%10==7)
                        {
                            cnt++;
                            break;
                        }
                        x/=10;
                    }
                }
        if(cnt)
            cout<<cnt<<endl;
        else cout<<"-1"<<endl;
    }
    return 0;
}