12927218561085 · 2666666 - 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:12927218561085 · 2666666 - 1
Verification status (*):Proven
Official Comment (*):Arithmetic progression (2,d=2697434638065*2^666668) [p199]
Proof-code(s): (*):L2078 : Dahlman, TwinGen, PrimeGrid, LLR
Decimal Digits:200700   (log10 is 200699.57459442)
Rank (*):26965 (digit rank is 1478)
Entrance Rank (*):2789
Currently on list? (*):no
Submitted:1/30/2011 22:54:33 CDT
Last modified:2/28/2011 14:45:29 CDT
Database id:97877
Status Flags:none
Score (*):41.699 (normalized score 0.0762)

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.
Arithmetic Progressions of Primes (archivable class *)
Prime on list: no, rank 15
Subcategory: "Arithmetic progression (2,d=*)"
(archival tag id 213147, tag last modified 2020-04-08 13:50:11)

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.
fieldvalue
prime_id97877
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 12927218561085 2 666666 -1 2>&1 [Elapsed time: 9.724 seconds]
modified2020-07-07 17:30:32
created2011-01-30 23:05:23
id125142

fieldvalue
prime_id97877
person_id9
machineRedHat Virtual STEM Server
whatprime
notesCommand: /home/caldwell/client/llr.pl 12927218561085*2^666666-1 2>&1 Starting Lucas Lehmer Riesel prime test of 12927218561085*2^666666-1 Using Zero Padded IBDWT : Mersenne fftlen = 32768, Used fftlen = 81920 V1 = 5 ; Computing U0... V1 = 5 ; Computing U0...done.Starting Lucas-Lehmer loop... 12927218561085*2^666666-1 is prime! Time : 912.470 sec. [Elapsed time: 15.20 minutes]
modified2020-07-07 17:30:32
created2011-01-30 23:21:03
id125146

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.