#define _USE_MATH_DEFINES
#include <bits/stdc++.h>

using namespace std;

#define dprint(Exp,...) if(Exp){fprintf(stderr, __VA_ARGS__);}
#define printe(...) fprintf(stderr, __VA_ARGS__);
#define PrtExp(_Exp)  cerr<< #_Exp <<" = "<< (_Exp)
#define PrtExpN(_Exp)  cerr<< #_Exp <<" = "<< (_Exp) <<"\n"

#define SINT(n) scanf("%d",&n)
#define SINT2(n,m) scanf("%d %d",&n,&m)
#define SINT3(n,m,o) scanf("%d %d %d",&n,&m,&o)
#define SINT4(n,m,o,p) scanf("%d %d %d %d",&n,&m,&o,&p)
#define SINT5(n,m,o,p,q) scanf("%d %d %d %d %d",&n,&m,&o,&p,&q)
#define SLL(n) scanf("%lld",&n)
#define SLL2(n,m) scanf("%lld %lld",&n,&m)
#define SLL3(n,m,o) scanf("%lld %lld %lld",&n,&m,&o)
#define SST(s) scanf("%s",s)
#define SCH(c) scanf("%c",&c)

#define GC() getchar()

#define PINT(n) printf("%d",(int)(n))
#define PINT2(n,m) printf("%d %d",(int)(n),(int)(m))
#define PINT3(n,m,l) printf("%d %d %d",(int)(n),(int)(m),(int)(l))
#define PLL(n) printf("%lld",(long long)(n))
#define PST(s) printf("%s",(s))
#define PCH(s) printf("%c",(s))

#define PINTN(n) printf("%d\n",(int)(n))
#define PINT2N(n,m) printf("%d %d\n",(int)(n),(int)(m))
#define PINT3N(n,m,l) printf("%d %d %d\n",(int)(n),(int)(m),(int)(l))
#define PLLN(n) printf("%lld\n",(long long)(n))
#define PSTN(s) printf("%s\n",(s))
#define PCHN(s) printf("%c\n",(s))

#define PSP() printf(" ")
#define PN() printf("\n")

#define PC(c) putchar(c)
#define CSP (' ')
#define SN ("\n")

#define rep(i,a) for(int i=0;i<a;i++)
#define reP(i,a) for(int i=0;i<=a;i++)
#define Rep(i,a) for(int i=a-1;i>=0;i--)
#define ReP(i,a) for(int i=a;i>=0;i--)

#define rEp(i,a) for(i=0;i<a;i++)
#define rEP(i,a) for(i=0;i<=a;i++)
#define REp(i,a) for(i=a-1;i>=0;i--)
#define REP(i,a) for(i=a;i>=0;i--)

#define repft(i,a,b) for(int i=a;i<b;i++)
#define repfT(i,a,b) for(int i=a;i<=b;i++)
#define Repft(i,a,b) for(int i=a-1;i>=b;i--)
#define RepfT(i,a,b) for(int i=a;i>=b;i--)

#define foreach(a,it) for(auto it = a.begin(); it != a.end(); ++it)

#define FILL(a,v) fill(begin(a),end(a), v)
#define FILL0(a) memset(a,0,sizeof(a))
#define FILL1(a) memset(a,-1,sizeof(a))

typedef long long ll;

typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll>   Pll;


const int INF = 0x2aaaaaaa; // 715,827,882
const ll INFLL = 0x1f1f1f1f1f1f1f1fLL;//2,242,545,357,980,376,863

template <class A, class B> inline ostream& operator<<(ostream& st, const pair<A, B>& P) { return st << "(" << P.first << "," << P.second << ")"; };
template <class A, class B> inline pair<A, B> operator+(const pair<A, B>& P, const pair<A, B>& Q) { return pair<A, B>(P.first + Q.first, P.second + Q.second); };
template <class A, class B> inline pair<A, B> operator-(const pair<A, B>& P, const pair<A, B>& Q) { return pair<A, B>(P.first - Q.first, P.second - Q.second); };

#define fs  first
#define sc  second


const int N = 1000000;
const int sqrtN = 1000;
bool isprime[N + 1] = {};

void sieve_of_atkin() {
	int n;
	for (int z = 1; z <= 5; z += 4) {
		for (int y = z; y <= sqrtN; y += 6) {
			for (int x = 1; x <= sqrtN && (n = 4 * x*x + y*y) <= N; ++x)
				isprime[n] = !isprime[n];
			for (int x = y + 1; x <= sqrtN && (n = 3 * x*x - y*y) <= N; x += 2)
				isprime[n] = !isprime[n];
		}
	}
	for (int z = 2; z <= 4; z += 2) {
		for (int y = z; y <= sqrtN; y += 6) {
			for (int x = 1; x <= sqrtN && (n = 3 * x*x + y*y) <= N; x += 2)
				isprime[n] = !isprime[n];
			for (int x = y + 1; x <= sqrtN && (n = 3 * x*x - y*y) <= N; x += 2)
				isprime[n] = !isprime[n];
		}
	}
	for (int y = 3; y <= sqrtN; y += 6) {
		for (int z = 1; z <= 2; ++z) {
			for (int x = z; x <= sqrtN && (n = 4 * x*x + y*y) <= N; x += 3)
				isprime[n] = !isprime[n];
		}
	}
	for (int n = 5; n <= sqrtN; ++n)
		if (isprime[n])
			for (int k = n*n; k <= N; k += n*n)
				isprime[k] = false;
	isprime[2] = isprime[3] = true;
}

int imos[100005] = {};

int main() {
	sieve_of_atkin();
	for (int i = 1; i < 100005; i += 2) {
		imos[i] = (isprime[i] && isprime[(i + 1) / 2]);
	}
	rep(i, 100004) imos[i + 1] += imos[i];

	int q;
	cin >> q;
	rep(i, q) {
		int l, r;
		cin >> l >> r;
		cout << imos[r] - imos[l-1] << endl;
	}


	//for (;;)getchar();

	return 0;
}

Measured memory_bytes: 2048