25 · 22141884 + 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.

This prime's information:

Description:25 · 22141884 + 1
Verification status (*):Proven
Official Comment (*):Divides Fermat F(2141872), GF(2141871,5), GF(2141872,10); generalized Fermat
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):L1741 : Granowski, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:644773   (log10 is 644772.72917276)
Rank (*):4468 (digit rank is 1)
Entrance Rank (*):88
Currently on list? (*):short
Submitted:9/12/2011 14:15:05 UTC
Last modified:3/11/2023 15:54:10 UTC
Database id:101943
Status Flags:none
Score (*):45.286 (normalized score 1.3031)

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.
Fermat Divisors (archivable *)
Prime on list: yes, rank 12, weight 48.504926878193
Subcategory: "Divides Fermat"
(archival tag id 213460, tag last modified 2023-07-18 02:37:34)
Generalized Fermat (archivable *)
Prime on list: no, rank 1331
Subcategory: "Generalized Fermat"
(archival tag id 213461, tag last modified 2024-06-24 12:37:18)
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 14, weight 48.504926878193
Subcategory: "Divides GF(*,5)"
(archival tag id 213462, tag last modified 2024-03-22 08:37:11)
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 11, weight 48.504926878193
Subcategory: "Divides GF(*,10)"
(archival tag id 213463, tag last modified 2023-07-02 21:37:20)

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):  (report abuse)
25*2^2141884+1 Divides Fermat F(2141872)
25*2^2141884+1 Divides GF(2141871,5)
25*2^2141884+1 Divides xGF(2141872,5,2)
25*2^2141884+1 Divides xGF(2141867,5,4)
25*2^2141884+1 Divides xGF(2141872,8,5)
25*2^2141884+1 Divides GF(2141872,10)

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 25 2 2141884 1 2>&1 [Elapsed time: 10.842 seconds]
modified2020-07-07 22:30:30
created2011-09-12 14:18:02

machineRedHat P4 P4
notesCommand: /home/caldwell/client/pfgw -t -q"25*2^2141884+1" 2>&1 PFGW Version [GWNUM 26.5] Primality testing 25*2^2141884+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 25*2^2141884+1 is prime! (9202.9641s+0.0015s) [Elapsed time: 2.56 hours]
modified2020-07-07 22:30:30
created2011-09-12 14:23:01

Query times: 0.0239 seconds to select prime, 0.0238 seconds to seek comments.
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