// Slower C++ solution:
#include <bits/stdc++.h>

#include <iomanip>

 

using namespace std;

 

typedef long long LL;

typedef long double LD;

typedef pair<int, int> PII;

typedef pair<LL, LL> PLL;

typedef pair<LD, LD> PLDLD;

typedef vector<int> VI;

typedef vector<LL> VLL;

typedef vector<char> VB;

 

#define FOR(i,a,b) for(int i=(a);i<(int)(b);++i)

#define REP(i,n) FOR(i,0,n)

#define CLR(a) memset((a), 0 ,sizeof(a))

#define ALL(a) a.begin(),a.end()

 

const LD eps=1e-10;

const long long INFLL=(LL)(1e9)*(LL)(1e9);

const int INF=1e9;

 

template<class T>

void chmin(T& a, const T b)

{

	if(a>b)

		a=b;

}

template<class T>

void chmax(T& a, const T b)

{

	if(a<b)

		a=b;

}

 

const LL pow(const LL p, const LL q)

{

	LL t=1;

	for(int i=0;i<q;i++)

		t*=p;

	return t;

}



template <typename T>

struct has_iter

{

	private:

		template <typename U>

		static constexpr true_type check(typename U::iterator*);

		template <typename U>

		static constexpr false_type check(...);



	public:

		static constexpr bool value = decltype(check<T>(nullptr))::value;

};





template<typename T, typename U = typename T::iterator>

void print(const T& container)

{

		auto&& first=begin(container), last=end(container);

		auto&& back=prev(last);

		for(auto e=first; e!=last; e=next(e))

			cout<<*e<<" \n"[e==back];

}





extern void* enabler;

template<typename Head, typename enable_if<!has_iter<Head>::value>::type*& = enabler>

void print(const Head& head)

{

	cout<<head<<endl;

}



template<> void print<string>(const string& container)

{

	cout<<container<<endl;

}



template<typename Head, typename... Tail>

void print(const Head& head, const Tail&... tail)

{

	cout<<head<<" ";

	print(tail...);

}



void io_speedup()

{

	cin.tie(0);

	ios::sync_with_stdio(false);

}



template<typename T>

istream& operator >> (istream& is, vector<T>& vec)

{

	for(T& x: vec) is >> x;

	return is;

}





template<typename T, typename U>

ostream& operator << (ostream& os, const pair<T, U>& p)

{

	os<<'('<<p.first<<", "<<p.second<<')';

	return os;

}



template<typename T>

vector<T> read(int n)

{

	vector<T> t(n);

	cin>>t;

	return t;

}



template<typename T>

T read()

{

	T t;

	cin>>t;

	return t;

}





template<unsigned int N> struct IsPrime {

	static const int size=(N>>5) + 1;

	unsigned int is_prime[size];

	constexpr IsPrime() : is_prime() {

		is_prime[0]=0x3;

		for(unsigned int i=2;i<N;i++)

		{

			if((is_prime[i>>5] & (1u<<(i&0x1f))) > 0)  continue;

			for(int j=i+i;j<N;j+=i)

				is_prime[j>>5]|=(1u<<(j&0x1f));

		}

	}

	constexpr bool operator[] (const int p) const

	{

		return (is_prime[p>>5] & (1u<<(p&0x1f))) == 0;

	}

};



template<int N> struct LikelyPrime {

	int sum[N+1];

	constexpr LikelyPrime(const IsPrime<N> pr) : sum() {

		for(int i=3;i<N;i++)

			sum[i+1]=sum[i]+((pr[i] && pr[(i+1)/2])?1:0 );

	}

	constexpr int operator[] (const int p) const

	{

		return sum[p];

	}

};



int main()

{

	constexpr IsPrime<100001> pr;

	constexpr LikelyPrime<100001> s(pr);

	int q=read<int>();

	REP(i,q)

	{

		int l,r;

		cin>>l>>r;

		print(s[r+1]-s[l]);

	}

}


// Faster C++ solution for the same problem (measured speedup: 1.2745192330590176x):
//#include <bits/stdc++.h>

#include<vector>

#include<iostream>

#include <iomanip>

 

using namespace std;

 

typedef long long LL;

typedef long double LD;

typedef pair<int, int> PII;

typedef pair<LL, LL> PLL;

typedef pair<LD, LD> PLDLD;

typedef vector<int> VI;

typedef vector<LL> VLL;

typedef vector<char> VB;

 

#define FOR(i,a,b) for(int i=(a);i<(int)(b);++i)

#define REP(i,n) FOR(i,0,n)

#define CLR(a) memset((a), 0 ,sizeof(a))

#define ALL(a) a.begin(),a.end()

 

const LD eps=1e-10;

const long long INFLL=(LL)(1e9)*(LL)(1e9);

const int INF=1e9;

 

template<class T>

void chmin(T& a, const T b)

{

	if(a>b)

		a=b;

}

template<class T>

void chmax(T& a, const T b)

{

	if(a<b)

		a=b;

}

 

const LL pow(const LL p, const LL q)

{

	LL t=1;

	for(int i=0;i<q;i++)

		t*=p;

	return t;

}



template <typename T>

struct has_iter

{

	private:

		template <typename U>

		static constexpr true_type check(typename U::iterator*);

		template <typename U>

		static constexpr false_type check(...);



	public:

		static constexpr bool value = decltype(check<T>(nullptr))::value;

};





template<typename T, typename U = typename T::iterator>

void print(const T& container)

{

		auto&& first=begin(container), last=end(container);

		auto&& back=prev(last);

		for(auto e=first; e!=last; e=next(e))

			cout<<*e<<" \n"[e==back];

}





extern void* enabler;

template<typename Head, typename enable_if<!has_iter<Head>::value>::type*& = enabler>

void print(const Head& head)

{

	cout<<head<<endl;

}



template<> void print<string>(const string& container)

{

	cout<<container<<endl;

}



template<typename Head, typename... Tail>

void print(const Head& head, const Tail&... tail)

{

	cout<<head<<" ";

	print(tail...);

}



void io_speedup()

{

	cin.tie(0);

	ios::sync_with_stdio(false);

}



template<typename T>

istream& operator >> (istream& is, vector<T>& vec)

{

	for(T& x: vec) is >> x;

	return is;

}





template<typename T, typename U>

ostream& operator << (ostream& os, const pair<T, U>& p)

{

	os<<'('<<p.first<<", "<<p.second<<')';

	return os;

}



template<typename T>

vector<T> read(int n)

{

	vector<T> t(n);

	cin>>t;

	return t;

}



template<typename T>

T read()

{

	T t;

	cin>>t;

	return t;

}





template<unsigned int N> struct IsPrime {

	static const int size=(N>>5) + 1;

	unsigned int is_prime[size];

	constexpr IsPrime() : is_prime() {

		is_prime[0]=0x3;

		for(unsigned int i=2;i<N;i++)

		{

			if((is_prime[i>>5] & (1u<<(i&0x1f))) > 0)  continue;

			for(int j=i+i;j<N;j+=i)

				is_prime[j>>5]|=(1u<<(j&0x1f));

		}

	}

	constexpr bool operator[] (const int p) const

	{

		return (is_prime[p>>5] & (1u<<(p&0x1f))) == 0;

	}

};



template<int N> struct LikelyPrime {

	unsigned short sum[N+1];

	constexpr LikelyPrime(const IsPrime<N> pr) : sum() {

		for(int i=3;i<N;i++)

			sum[i+1]=sum[i]+(unsigned short)((pr[i] && pr[(i+1)/2])?1:0 );

	}

};



int q;

int l,r;

int main()

{

	cin.tie(0);

	cout.tie(0);

	ios::sync_with_stdio(false);



	constexpr IsPrime<100001> pr;

	constexpr LikelyPrime<100001> s(pr);

	cin>>q;

	while(q--)

	{

		cin>>l>>r;

		cout<<s.sum[r+1]-s.sum[l]<<"\n";

	}

}