U(50833)
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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:U(50833)
Verification status (*):PRP
Official Comment:Fibonacci number
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):CH4 : Irvine, Water, Broadhurst, Primo, OpenPFGW, CHG
Decimal Digits:10624   (log10 is 10623.119231825)
Rank (*):72431 (digit rank is 1)
Entrance Rank (*):29399
Currently on list? (*):short
Submitted:10/7/2005 02:12:43 CDT
Last modified:11/19/2005 09:59:50 CDT
Database id:75849
Status Flags:Verify
Score (*):32.6274 (normalized score 0)

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.
Fibonacci Number (archivable *)
Prime on list: yes, rank 3
Subcategory: "Fibonacci Number"
(archival tag id 194195, tag last modified 2015-10-16 13:50:31)

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.

Chris Caldwell writes (11 Sep 2014): 
CHG proof with ECPP helpers. Certificate of proof may be found in http://physics.open.ac.uk/~dbroadhu/cert/b50833.zip

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_id75849
person_id9
machineLinux P4 2.8GHz
whatprp
notesCommand: /home/caldwell/client/pfgw -f -tc -q"U(50833)" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing U(50833) [N-1/N+1, Brillhart-Lehmer-Selfridge]
trial factoring to 3067356
Running N-1 test using base 5
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(4096,21) to FFT(4096,20)
Reduced from FFT(4096,20) to FFT(4096,19)
Reduced from FFT(4096,19) to FFT(4096,18)
70588 bit request FFT size=(4096,18)
Running N+1 test using discriminant 11, base 1+sqrt(11)
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(4096,21) to FFT(4096,20)
Reduced from FFT(4096,20) to FFT(4096,19)
Reduced from FFT(4096,19) to FFT(4096,18)
70596 bit request FFT size=(4096,18)
Calling N-1 BLS with factored part 0.49% and helper 0.33% (1.81% proof)
U(50833) is Fermat and Lucas PRP! (91.3009s+0.0024s)
[Elapsed time: 91 seconds]
modified2005-10-19 12:27:07
created2005-10-07 02:13:10
id81042

Query times: 0.0004 seconds to select prime, 0.0003 seconds to seek comments.