1209 · 2539269 + 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:1209 · 2539269 + 1
Verification status (*):Proven
Official Comment:Divides GF(539264,5)
Proof-code(s): (*):L1575 : Ferrara, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:162340   (log10 is 162339.22715802)
Rank (*):32707 (digit rank is 2)
Entrance Rank (*):4604
Currently on list? (*):no
Submitted:8/13/2010 18:53:30 CDT
Last modified:8/13/2010 19:50:32 CDT
Database id:94167
Status Flags:none
Score (*):41.0463 (normalized score 0.0434)

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: no, rank 34, weight 48.1438776497072
Subcategory: "Divides GF(*,5)"
(archival tag id 210813, tag last modified 2020-03-13 22:50:11)

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.
machineDitto P4 P4
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 1209 2 539269 1 2>&1
[Elapsed time: 9.785 seconds]
modified2011-12-27 16:48:38
created2010-08-13 19:05:02

machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -t -q"1209*2^539269+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 1209*2^539269+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(65536,20) to FFT(65536,19)
Reduced from FFT(65536,19) to FFT(65536,18)
Reduced from FFT(65536,18) to FFT(65536,17)
1078568 bit request FFT size=(65536,17)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
1209*2^539269+1 is prime! (1440.6900s+0.0000s)
[Elapsed time: 24.38 minutes]
modified2010-10-13 12:41:35
created2010-08-13 19:08:01

Query times: 0.0004 seconds to select prime, 0.0007 seconds to seek comments.