I'm a bit confused: I see several threads running aparent infite loops generating numbers. It doesn't seem to be lazily evaluated (or is it?). Is this going to run until it runs out of memory (or thread handles)?

When it runs, it is going to spawn a thread generating a sequence of numbers, then another one taking that sequence, start generating a new sequence based on that skipping multiples of a particular number, then start another one doing the same. Number of threads seems to always go up. Is that the right analysis of the code? Doesn't seem right to me.