[QUOTE=davieddy;265491]I think all your qualms boil down to obtaining an unbiassed estimate of the probability of the non-zero residue of an unverified LL being wrong.[/QUOTE]Okay.

[QUOTE=Christenson;265277]P-1 is also good work for a CPU; I'm finding factors on average in significantly fewer GHz days than it would take to do two LL tests. You just have to give it a lot (a Gigabyte or so) of memory.[/QUOTE]

A Gigabtye is good. Mutliple Gigabytes are even better.

But half a Gigabyte per core, or even less, should be quite adequate for someone who wishes to specialize in this type of work.