71 · 21873569 + 1
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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

This prime's information:

field (help)value
Description:71 · 21873569 + 1
Verification status (*):Proven
Official Comment:Divides GF(1873568,5)
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):L1223 : Courty, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:564003   (log10 is 564002.31920452)
Rank (*):2048 (digit rank is 1)
Entrance Rank (*):115
Currently on list? (*):short
Submitted:9/2/2011 06:46:47 CDT
Last modified:7/14/2012 13:50:36 CDT
Database id:101464
Status Flags:none
Score (*):44.875 (normalized score 2.2494)

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.
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 9, weight 49.1377494665858
Subcategory: "Divides GF(*,5)"
(archival tag id 214436, tag last modified 2019-10-16 18:20:19)

User comments about this prime (disclaimer):

User comments are allowed to convey mathematical information about this number, how it was proven prime.... See our guidelines and restrictions.

PrimeGrid writes (11 Sep 2014): 
71*2^1873569+1 Divides GF(1873568,5)
71*2^1873569+1 Divides xGF(1873568,7,3)

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 71 2 1873569 1 2>&1
[Elapsed time: 9.985 seconds]
modified2011-12-27 16:48:29
created2011-09-02 06:48:01

machineRedHat Virtual STEM Server
notesCommand: /home/caldwell/client/pfgw -t -q"71*2^1873569+1" 2>&1
PFGW Version [GWNUM 25.14]
Primality testing 71*2^1873569+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
71*2^1873569+1 is prime! (4329.5692s+0.0849s)
[Elapsed time: 72.17 minutes]
modified2011-12-27 16:48:29
created2011-09-02 06:52:32

Query times: 0.0002 seconds to select prime, 0.0002 seconds to seek comments.