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 PyPy3 (7.3.0) (judge verdict: Accepted)

from itertools import accumulate
import math
m = 10**5

L = [x for x in range(2,m+1)]

#エラトステネスのふるいで素数を抽出
for y in range(2, int(math.sqrt(m)+1)):
    L = [z for z in L if(z == y or z % y != 0)]

#N+1/2も素数であるものを抽出
P = []
for w in L:
    if (w+1)/2 in L:
        P.append(w)

#累積和のために作成
G = [0] * (m+1)
for i in P:
    G[i+1] = 1

#累積和
Q = list(accumulate(G))



n = int(input())
for _ in range(n):
    s, t = map(int, input().split())
    print(Q[t+1]-Q[s])




'''
この素数判定は遅い。
上のようにエラトステネスの篩を使う

def isPrime(n):

    if n == 1:
        return False
    if n % 2 == 0:
        return False
    for i in range(3, int(math.sqrt(n)+1), 2):
        if n % i == 0:
            return False
    return True

'''