Greatest Greatest Common Divisor HD5207 Greatest Greatest Common Divisor

 
 Accepts: 271
 
 Submissions: 1138
 Time Limit: 4000/2000 MS (Java/Others)
 
 Memory Limit: 65536/65536 K (Java/Others)
Problem Description

Pick two numbers  from a sequence to maximize the value of their greatest common divisor.

Input

Multiple test cases. In the first line there is an integer , indicating the number of test cases. For each test cases, the first line contains an integer , the size of the sequence. Next line contains  numbers, from . The case for  is no more than .

Output

For each test case, output one line. The output format is Case # is the case number, starting from  is the maximum value of greatest common divisor.

Sample Input
2
4
1 2 3 4
3
3 6 9
Sample Output
Case #1: 2
Case #2: 3

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