//A tree without skin will surely die.
//A man without face is invincible.
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(S) ((int)S.size())
#define FOR(i, st_, n) for(int i = st_; i < n; ++i)
#define RFOR(i, n, end_) for(int i = (n)-1; i >= end_; --i)
#define x first
#define y second
#define pb push_back
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef unsigned long long ull;
typedef long double LD;
typedef pair<ull, ull> pull;
using namespace __gnu_pbds;
typedef tree<ll, null_type, less<>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
using namespace std;
#ifdef ONPC
mt19937 rnd(228);
#else
mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
#endif
const int MAX_N=1e7+47;

int C[MAX_N];
int PC[MAX_N];


// 2 3 4 5 6 7 8 9 10
// 1 1 1 1 2 1 1 1 2
int solve()
{
	int n;
	if(!(cin>>n))return 1;
	FOR(i,2,MAX_N)
	{
		if(C[i]!=0) continue;
		for(int j=i; j < MAX_N; j += i)
			C[j]+=1;
	}
	FOR(i,2,MAX_N)
	{
		PC[i]=PC[i-1];
		if(C[i]%2==0)PC[i]+=1;
	}
	FOR(i,0,n)
	{
		int l, r;
		cin>>l>>r;
		cout<<(PC[r]-PC[l-1] - (r-l+1-(PC[r]-PC[l-1])))<<'\n';
	}
    return 0;
}

int32_t main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int TET = 1e9;
    //cin >> TET;
    for (int i = 1; i <= TET; i++)
    {
        if (solve())
        {
            break;
        }
#ifdef ONPC
        cout << "__________________________" << endl;
#endif
    }
#ifdef ONPC
    cerr << endl << "finished in " << clock() * 1.0 / CLOCKS_PER_SEC << " sec" << endl;
#endif
}