Problem:
Score : 400 points

Problem Statement

We say that a odd number N is similar to 2017 when both N and (N+1)/2 are prime.

You are given Q queries.

In the i-th query, given two odd numbers l_i and r_i, find the number of odd numbers x similar to 2017 such that l_i ≤ x ≤ r_i.

Constraints

1≤Q≤10^5

1≤l_i≤r_i≤10^5

l_i and r_i are odd.

All input values are integers.

Input

Input is given from Standard Input in the following format:

Q
l_1 r_1
:
l_Q r_Q

Output

Print Q lines. The i-th line (1≤i≤Q) should contain the response to the i-th query.

Sample Input 1

1
3 7

Sample Output 1

2

3 is similar to 2017, since both 3 and (3+1)/2=2 are prime.

5 is similar to 2017, since both 5 and (5+1)/2=3 are prime.

7 is not similar to 2017, since (7+1)/2=4 is not prime, although 7 is prime.

Thus, the response to the first query should be 2.

Sample Input 2

4
13 13
7 11
7 11
2017 2017

Sample Output 2

1
0
0
1

Note that 2017 is also similar to 2017.

Sample Input 3

6
1 53
13 91
37 55
19 51
73 91
13 49

Sample Output 3

4
4
1
1
1
2

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Time Limit Exceeded)

import java.io.PrintWriter;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		int[] p = new int[100001];
		p[2] = 1;
		p[3] = 1;
		for (int i = 5; i <= 100000; i += 2) {
			p[i] = 1;
			for (int j = 3; j < i; j += 2)
				if (i % j == 0) {
					p[i] = 0;
					break;
				}
		}
		int q = Integer.parseInt(sc.next());
		int[] ans = new int[q];
		for (int i = 0; i < q; i++) {
			int l = Integer.parseInt(sc.next());
			int r = Integer.parseInt(sc.next());
			for (int j = l; j <= r; j += 2)
				if (p[j] == 1 && p[(j + 1) / 2] == 1)
					ans[i]++;
		}
		for (int i = 0; i < q; i++)
			out.println(ans[i]);
		out.flush();
	}
}