3 · 22478785 + 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:3 · 22478785 + 1
Verification status (*):Proven
Official Comment:Divides Fermat F(2478782), GF(2478782,3), GF(2478776,6), GF(2478782,12)
Proof-code(s): (*):g245 : Cosgrave, NewPGen, PRP, Proth.exe
Decimal Digits:746190   (log10 is 746189.114923196)
Rank (*):617 (digit rank is 1)
Entrance Rank (*):7
Currently on list? (*):short
Submitted:10/14/2003 09:15:38 CDT
Last modified:10/14/2003 09:15:38 CDT
Database id:66628
Status Flags:none
Score (*):45.7345 (normalized score 7.2237)

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 4, weight 46.8331340662619
Subcategory: "Divides GF(*,12)"
(archival tag id 187025, tag last modified 2016-03-15 13:57:15)
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 4, weight 46.8331340662619
Subcategory: "Divides GF(*,6)"
(archival tag id 187024, tag last modified 2016-03-15 13:57:15)
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 7, weight 46.8331340662619
Subcategory: "Divides GF(*,3)"
(archival tag id 187023, tag last modified 2016-03-15 13:57:15)
Fermat Divisors (archivable *)
Prime on list: yes, rank 5, weight 46.8331340662619
Subcategory: "Divides Fermat"
(archival tag id 187022, tag last modified 2016-03-15 13:57:14)

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_id66628
person_id9
machineLinux P4 2.8GHz
whatprime
notesCommand: /home/caldwell/client/pfgw -f -t -q"3*2^2478785+1" 2>&1
PFGW Version 20030811.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
trial factoring to 289235494
Running N-1 test using base 5
Primality testing 3*2^2478785+1 [N-1, Brillhart-Lehmer-Selfridge]
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(327680,19) to FFT(327680,18)
Reduced from FFT(327680,18) to FFT(327680,17)
Reduced from FFT(327680,17) to FFT(327680,16)
4957582 bit request FFT size=(327680,16)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
3*2^2478785+1 is prime! (126155.4235s+0.0018s)
modified2003-10-24 15:08:27
created2003-10-14 09:23:01
id71537

Query times: 0.0016 seconds to select prime, 0.0005 seconds to seek comments.