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Old 2020-06-28, 04:12   #2
Uncwilly
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For the older one you can do PRP-CF (PRP tests on the cofactors of Mersenne numbers.) They tend to be shorter assignments, just 2-3 GHz-days.
You can also do ECM, those are really short. That is trying to find factors on numbers we know are composite.

There is not really any First Time checks that won't be long on the newer machine. If you have a bunch of RAM that you can spare, look at P-1. Those can be shorter, you can find factors.

Welcome to the group . Enjoy yourself.
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