NAJPWG  Playing with GCD
Tanmoy recently learn about euclid gcd algorithm.
This algorithm looks like:
gcd(a,b):
if(b==0):return a
return gcd(b,a%b)
Now he want to find out how many pair (x,y) can be possible in range N, which gcd is greater than 1. Here pair (x,y) and (y,x) consider as same pair. 1<=x,y<=N.
He can find out it small number easily but for a large number its realy hard to find out. Now he needs your help. Write a programme that find out number of such pair.
Input:
Input start with an integer number T(≤10^5), which is number of test cases.
Each test case contain a integer N (1≤N≤10^5).
Output:
For each case, Print case Number and Desired answer
Sample:
Input 
Output 
2

Case 1: 2 
hide comments
mursaleen:
20200805 08:00:52
About output format : There's no blank line before the first test case. And there's a space between "Case" and the case number, and between the colon (':') and the answer. 

dhruv788:
20200716 18:16:04
Beware of the output format , There is no next line before the test case 1


thiefthief:
20191005 07:10:46
??????? Last edit: 20191005 07:40:34 

selfcoder24:
20190713 17:29:24
Concept of Phi and observation. Be extra sure on the output format :) 

immim:
20181222 06:03:14
Phi Sieve + Cumulative sum.....See output format. :) 

m2do:
20180312 19:36:09
Euler Totient + DP <3 

itachi_2016:
20180102 15:27:33
Very easy ! 

chetan4060:
20180101 11:45:39
ac in second go:)


mahilewets:
20170908 14:38:53
Sudden AC after realizing I can precalc for all possible queries 

mahilewets:
20170907 16:31:10
I think answer(3)=2 because gcd(2,2)=2>1 and gcd(3,3)=3>1

Added by:  Najmuzzaman 
Date:  20141031 
Time limit:  0.5s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 