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Agreed. Thanks for the optimization. It had occurred to me, but I was already overstepping the bounds a bit - except the OP was sooooo close.

On one hand, you're very close. On the other hand, there are some things I would do differently:

1. Some recusive methods return a value. This one doesn't need to.
2. The base case should be...

Why didn't you show that code that almost or partly worked? I don't see any recursion here, and what is the method evens()?