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39 · 2781220 - 1

At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important PrimePages database: a collection of research, records and results all about prime numbers. This page summarizes our information about one of these primes.

Description:39 · 2781220 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L138 : Soule, NewPGen, Rieselprime, LLR
Decimal Digits:235173   (log10 is 235172.24427722)
Rank (*):21139 (digit rank is 1)
Entrance Rank (*):211
Currently on list? (*):no
Submitted:9/17/2006 09:39:13 CDT
Last modified:9/17/2006 10:39:55 CDT
Removed (*):5/27/2012 13:01:44 CDT
Database id:78504
Status Flags:none
Score (*):42.1866 (normalized score 0.1349)

Verification data:

The Top 5000 Primes is a list for proven primes only. In order to maintain the integrity of this list, we seek to verify the primality of all submissions.  We are currently unable to check all proofs (ECPP, KP, ...), but we will at least trial divide and PRP check every entry before it is included in the list.
machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 39 2 781220 -1 2>&1
[Elapsed time: 10.191 seconds]
modified2007-03-03 21:00:43
created2006-09-17 09:52:01

machineRedHat P4 P4
notesCommand: /home/caldwell/client/ 39*2^781220-1 2>&1
Starting Lucas Lehmer Riesel prime test of 39*2^781220-1
V1 = 3 ; Computing U0...
Done Computing U0.
Starting Lucas-Lehmer loop...
39*2^781220-1 is prime! Time : 2813.717 sec.
[Elapsed time: 2814 seconds]
modified2007-03-03 21:00:43
created2006-09-17 09:53:01

Query times: 0.0005 seconds to select prime, 0.0007 seconds to seek comments.
Printed from the PrimePages <> © Chris Caldwell.