is there sieving I can do for GFN-15s?
sieving for PPS takes extremely long, GFN-15s took seconds to complete.
if there's GFN-15 sievings, they would take shorter right?
that's what I'd like to help you guys w/, but there isn't one where I can
select in the preference grid.

... sieving IS where you factor for other people, am I correct?

I can't see any other sieving than PPS, I think I have to do them manually,
and that would be worse because the GPU I'm using is not connected to this computer,
it's on one of those virtual machines and are electrically made, hence temporary.

Try completing one task of PPS Sieve and see if the credit you earn is acceptable compared to the time the task takes on your machine.

Thank you for doing sieving. Yes, it removes candidates by finding factors.

/JeppeSN