Hello. My program is supposed to accept #test cases. For each test case, it must accept two integers as a range, then return all prime numbers within the range.
Currently, it prints odd numbers within the range.
So I suspect my problem is within the Boolean i'm using to test whether a number is prime or not.
I pulled the code for the Boolean from this site - http://www.mkyong.com/java/how-to-determine-a-prime-number-in-java/ Maybe I didn't quite understand it, or maybe that's not my real issue.
Any help would be greatly appreciated. Please, and thank you!

albert abbene wrote:Any help would be greatly appreciated. Please, and thank you!

Another little wrinkle for you: Your program accepts ints for its range values, and yet uses a calculation method that takes a long. There's nothing intrinsically wrong with it, but it will slow things down unnecessarily, because arithmetic on longs takes longer (no pun intended). It also wastes space, because your ArrayList has to hold Longs when it could be holding Integers.

Winston

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You really only need to test (6*n + 1) and (6*n - 1) for all positive integer values of n, once you get 2 and 3 on your list. That eliminates another 33%.

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors