Cunningham ECM efforts

[charybdis]

Originally Posted by Tyler Busby

Sorry if this is the wrong place to ask, but I saw this thread pop up on the new posts and figured I'd ask here, is there a current record of ECM done for various Cunningham numbers? Or a general rules for what can realistically be expected to have been performed?

There is no official record, but a general rule of thumb is that everything in the main Cunningham tables (bases 2-12, upper limits depending on base but generally ~400 digits) has had at least t60. Many have had substantially more. This applies to lots of the base 3-12 numbers in that OEIS list.

Kurt Beschorner's page has some data on ECM efforts for base 10 though it looks to be incomplete.

[frmky]

Originally Posted by swellman

2,2206L is currently sieving, personally I’m hoping for it to be factored by mid March but it’s not a race.

And it is. It involved solving a >152M matrix on eight A100's in about 70 hours. Everything went surprisingly smoothly.