16869987339975 · 2171960 - 1
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The hardware and software on this system was updated September 4th.  Please let me know of any problem you encounter. <caldwell@utm.edu>

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:16869987339975 · 2171960 - 1
Verification status (*):Proven
Official Comment:Twin (p)
Proof-code(s): (*):x24 : Jarai_Z, Farkas, Csajbok, Kasza, Jarai, Unknown
Decimal Digits:51779   (log10 is 51778.3451691349)
Rank (*):45967 (digit rank is 2)
Entrance Rank (*):8233
Currently on list? (*):short
Submitted:9/8/2005 03:46:06 CDT
Last modified:9/8/2005 09:40:50 CDT
Database id:75542
Status Flags:none
Score (*):37.5249 (normalized score 0.0026)

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.
Twin Primes (archivable *)
Prime on list: yes, rank 7
Subcategory: "Twin (p)"
(archival tag id 189944, tag last modified 2014-07-25 02:21:47)

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_id75542
person_id9
machineLinux P4 2.8GHz
whatprime
notesCommand: /home/caldwell/client/llr.pl 16869987339975*2^171960-1 2>&1
Starting Lucas Lehmer Riesel prime test of 16869987339975*2^171960-1
V1 = 11 ; Computing U0...
Done Computing U0.
Starting Lucas-Lehmer loop...
16869987339975*2^171960-1 is prime! Time: 632.395 sec.
[Elapsed time: 633 seconds]
modified2005-09-23 12:19:27
created2005-09-08 03:53:00
id80710

Query times: 0.0004 seconds to select prime, 0.0005 seconds to seek comments.