Checking correctness of factors found during our PPS Sieve project, I detected few suspicious gaps which are lacking factors completely. Either these ranges wasn't tested at all due to some software bugs or cheating, either results of these tests were lost on our side. These gaps are in relatively low ranges (currently found around 40P and 170P), and recovering missing factors could remove significant amount of candidates from our sieve files.

From time to time, I'll load a set of these verification tasks. So if you'll see that range you're sieving is low, or task is running longer or faster than usual - don't worry, everything is working as planned. Verification in done in each gap separately, i.e. inside very short intervals and sometimes it's just not possible to maintain standard task length for all tasks within this interval. So length of last task may be adjusted plus/minus 50%. When it happens, credit will be also adjusted according to changed runtime.