mersenneforum.org I think I found a huge prime
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 2008-01-14, 21:05 #1 monst     Mar 2007 179 Posts I think I found a huge prime LLR has reported a very large prime on one of my computers today. No - it's not more than 10 million digits, but it is larger than any other I've been involved with in the Prime Pages database. I will re-run this number with both LLR and PFGW on the two cores of another machine. Stay tuned. Last fiddled with by monst on 2008-01-14 at 21:42 Reason: will confirm with PFGW instead of Proth
 2008-01-14, 21:37 #2 Flatlander I quite division it     "Chris" Feb 2005 England 31·67 Posts How many digits?
 2008-01-14, 21:46 #3 monst     Mar 2007 B316 Posts Just under a million, but larger than SB9.
 2008-01-15, 00:49 #4 axn     Jun 2003 471210 Posts Assuming the doublecheck pans out... Grats! However, if it is a base-2 number, then LLR has already "proven" it so you can submit it to Prime Pages directly; no need for a doublecheck (especially with PFGW which will take a lot more time).
 2008-01-15, 01:50 #5 monst     Mar 2007 179 Posts The form of the number is: k*2^n - 1 I realize the LLR has proven it prime, but I want to double-check that there was no glitch during the initial LLR run. On my second machine, LLR will finish in about 4 hours. PFGW will take much longer. If LLR reports it prime again, I will submit it to the Prime Pages for their verification. Furthermore, this number is NOT part of a twin pair; NOR part of a Sophie Germain pair. (That would have shattered those records!)
2008-01-15, 02:07   #6
axn

Jun 2003

23·19·31 Posts

Quote:
 Originally Posted by monst The form of the number is: k*2^n - 1 I realize the LLR has proven it prime, but I want to double-check that there was no glitch during the initial LLR run. On my second machine, LLR will finish in about 4 hours. PFGW will take much longer. If LLR reports it prime again, I will submit it to the Prime Pages for their verification.
Excellent. Looking forward to seeing a new entry up in the top

BTW, were you doing a fixed-n or fixed-k search?

 2008-01-15, 05:07 #7 monst     Mar 2007 179 Posts The LLR test on the second computer confirmed the first result... 3139*2^3321905-1 is prime (999,997 digits) I have entered it into the Primes database for verification.
 2008-01-15, 05:31 #8 paulunderwood     Sep 2002 Database er0rr 2×1,723 Posts Remarkable! Congrats.
 2008-01-15, 11:05 #9 Andi47     Oct 2004 Austria 7×353 Posts Congratulations!
 2008-01-15, 11:22 #10 robert44444uk     Jun 2003 Oxford, UK 5×379 Posts congrats. A monster from Monst !!
2008-01-15, 11:57   #11
Cruelty

May 2005

2×809 Posts

Quote:
 Originally Posted by monst The LLR test on the second computer confirmed the first result... 3139*2^3321905-1 is prime (999,997 digits) I have entered it into the Primes database for verification.
Any details on this remarkable discovery? Sieve depth? Weight of this particular "k"? Ranges of "n" you have tested? etc.
Anyways HUGE congratulations

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