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2020-08-06, 08:23   #2391
preda

"Mihai Preda"
Apr 2015

126010 Posts

Quote:
 Originally Posted by storm5510 The worktodo line said "PRP" only. The result line says "PRP-3." Below is a test I pulled from Primenet for demonstration only. I unreserved it later. Code: PRP=xxxx,1,2,10369241,-1,99,0,"765044109502655639249" The assignment in my account also reads "PRP." The reservation was from "Double-check tests on Mersenne cofactors." I do not know how a determination is made based on the work line as to the type.
It seems GpuOwl accepts the PRP line with the cofactor present, but GpuOwl not being aware of or using the cofactor in any way may be sub-optimal. GpuOwl will simply run a classic PRP test, which guess what will turn out "not prime", but that was already known at the start.

MPrime OTH may make some use of the cofactor by running a PRP-CF test.

(best use GpuOwl for "first time PRP" or similar)

Last fiddled with by preda on 2020-08-06 at 08:24