1268979 · 21268979 - 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:1268979 · 21268979 - 1
Verification status (*):Proven
Official Comment (*):Woodall
Proof-code(s): (*):L201 : Siemelink, LLR
Decimal Digits:382007   (log10 is 382006.84632212)
Rank (*):11859 (digit rank is 1)
Entrance Rank (*):90
Currently on list? (*):short
Submitted:1/25/2007 16:27:47 CDT
Last modified:1/25/2007 18:59:26 CDT
Database id:79267
Status Flags:none
Score (*):43.6781 (normalized score 0.569)

Archival tags:

There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper.  Such primes are tracked with archival tags.
Woodall Primes (archivable *)
Prime on list: yes, rank 6
Subcategory: "Woodall Primes"
(archival tag id 187082, tag last modified 2018-03-28 13:50:05)

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 1268979 2 1268979 -1 2>&1 [Elapsed time: 10.590 seconds]
modified2020-07-07 17:30:42
created2007-01-25 16:52:02

machineRedHat P4 P4
notesCommand: /home/caldwell/client/llr.pl 1268979*2^1268979-1 2>&1 Starting Lucas Lehmer Riesel prime test of 1268979*2^1268979-1 V1 = 5 ; Computing U0... Done Computing U0. Starting Lucas-Lehmer loop... 1268979*2^1268979-1 is prime! Time : 7584.758 sec. [Elapsed time: 7584 seconds]
modified2020-07-07 17:30:42
created2007-01-25 16:53:02

Query times: 0.0004 seconds to select prime, 0.0007 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.