289 · 21317378 + 1
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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:289 · 21317378 + 1
Verification status (*):Proven
Official Comment:Generalized Fermat
Proof-code(s): (*):L1132 : Rickard, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:396573   (log10 is 396572.75452567)
Rank (*):5479 (digit rank is 1)
Entrance Rank (*):402
Currently on list? (*):no
Submitted:1/11/2012 13:06:00 CDT
Last modified:1/11/2012 15:50:23 CDT
Removed (*):2/10/2018 14:53:56 CDT
Database id:103905
Status Flags:none
Score (*):43.7931 (normalized score 0.9292)

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 (archivable *)
Prime on list: no, rank 599
Subcategory: "Generalized Fermat"
(archival tag id 213777, tag last modified 2018-07-15 12:20:24)

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 289 2 1317378 1 2>&1
[Elapsed time: 9.499 seconds]
modified2012-02-19 19:07:48
created2012-01-11 13:18:13

machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -t -q"289*2^1317378+1" 2>&1
PFGW Version [GWNUM 26.5]
Primality testing 289*2^1317378+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
289*2^1317378+1 is prime! (4093.6946s+0.0010s)
[Elapsed time: 68.23 minutes]
modified2012-02-19 19:07:48
created2012-01-11 14:16:45

Query times: 0.0005 seconds to select prime, 0.0006 seconds to seek comments.