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Old 2008-10-31, 10:14   #1
NBtarheel_33's Avatar
Jul 2008
Maryland, USA

5×223 Posts
Question Recommended TF bit levels for M(>10^8)


Wondering if anyone knows around what bit level we should TF up to for LMH-sized numbers. I think I remember seeing something like 2^72 for numbers around M100,000,000, but I'm thinking about even bigger numbers - for instance, I was looking at numbers around M867530900 ("Jenny numbers"!) - it seems like it might be wise to go almost up to 80 bits here? I recently also worked on M999999937 (biggest number PrimeNet lists), factoring up to 2^73 - that took the better part of 24 hours, but considering that the LL test timed out to almost 70 years, I guess it's worthwhile to go much higher. Where should we start P-1'ing numbers this huge?
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