SNGPG  Prime Generator The Easiest Question Ever
Prime number questions are always being favorite to everyone. This question is extension to the problem PRIME GENERATOR. The question is very very simple and easier than that you cannot imagine. You have to count total number of such primes p in the range [a ≥ 0, b > 0] so that (p^{2} + 1) or/and (p^{2} + 2) is/are prime(s).
Input
First line of input is t, (t < 100) total number of test cases. Next t lines contains two integers a and b seperated by space.
a < 50001, b < 100001 and b > a.
Output
In each line print total numbers of such prime numbers.
Example
Input: 2
0 1
4 5 Output: 2
0
[Consider 0 and 1 as prime numbers for this question]
hide comments
dushyant_bgs:
20160627 19:48:42
Just observe and get 0.00s. :) 

mkfeuhrer:
20160618 22:49:28
took less than 15 min to solve and code !! tutorials > 

akshayvenkat:
20160510 11:51:10
NotUsingPenAndPaper Solution  0.81s


vikash1143:
20160309 06:28:16
python 3 lines..AC in 1st attempt 

aditya1997:
20160212 12:08:45
easiest question ever!!!! my 50 th :) 

Siddharth Singh:
20151226 06:53:52
Though i got an AC , i'm still confused because if i giv input 0 9 it gives me ans of 4


newbie:
20151112 22:37:32
simplest problem ever got ac in 0.00 :D


shravinson:
20150831 20:26:41
Last edit: 20150831 20:37:45 

hodobox:
20150831 14:24:47
Time limit way too high, with precomputation it takes 0.04s in C++, and the simplest bruteforce without precomputation takes 1.64 :P Last edit: 20150831 18:19:11 

Vicky:
20150819 16:48:36
very simple just need observation :P

Added by:  AvmnuSng 
Date:  20130908 
Time limit:  5s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  Abhimanyu Singh My Problems 