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Old 2022-01-11, 09:53   #298
bur
 
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Aug 2020
79*6581e-4;3*2539e-3

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Default New factorial prime

A new factorial prime was recently reported (not yet validated):

288465! + 1

It is very close to the PRPnet search wavefront, is that a coincidence?
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Old 2022-01-18, 23:36   #299
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Congrats to PrimeGrid for the "321" prime 3*2^18196595 - 1 (5,477,722 decimal digits, rank 20)
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Old 2022-01-20, 16:54   #300
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Sniped again! Congrats to Ryan Propper for the factorial prime 308084! + 1 (1,557,176 decimal digits)
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Old 2022-01-20, 17:54   #301
bur
 
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Great to see such progress on the Factorials. Apparently there were so few over the years because few people were working on them. I still think it'd be nice if the work was organized so ranges aren't done twice or thrice, which might well be the case now.
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Old 2022-01-20, 20:33   #302
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Quote:
Originally Posted by bur View Post
Great to see such progress on the Factorials. Apparently there were so few over the years because few people were working on them. I still think it'd be nice if the work was organized so ranges aren't done twice or thrice, which might well be the case now.
Don't know who else out there is working on these, but I've sieved (and plan to test) n! ± 1 for 300,000 <= n <= 500,000.
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