U(54521)/6403194135342743624071073
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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(54521)/6403194135342743624071073
Verification status (*):PRP
Official Comment:Fibonacci cofactor, ECPP
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):c8 : Water, Broadhurst, Primo
Decimal Digits:11370   (log10 is 11369.059252398)
Rank (*):71891 (digit rank is 3)
Entrance Rank (*):67363
Currently on list? (*):short
Submitted:1/6/2015 18:01:03 CDT
Last modified:1/6/2015 18:20:29 CDT
Database id:119057
Status Flags:Verify, TrialDiv
Score (*):32.8377 (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.
Elliptic Curve Primality Proof (archivable *)
Prime on list: no, rank 100
Subcategory: "ECPP"
(archival tag id 217878, tag last modified 2017-10-14 12:20:20)
Fibonacci cofactor (archivable *)
Prime on list: yes, rank 4
Subcategory: "Fibonacci cofactor"
(archival tag id 217879, tag last modified 2017-04-14 17:50:17)

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.

David Broadhurst writes (6 Jan 2015): 
certificate

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_id119057
person_id9
machineUsing: Xeon 4c+4c 3.5GHz
whatprp
notesCommand: /home/caldwell/client/pfgw/pfgw64 -tc -q"U(54521)/6403194135342743624071073" 2>&1
PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11]
Primality testing U(54521)/6403194135...3624071073 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N+1 test using discriminant 5, base 4+sqrt(5)
Calling N-1 BLS with factored part 0.06% and helper 0.05% (0.22% proof)


U(54521)/6403194135...3624071073 is Fermat and Lucas PRP! (8.9262s+0.0008s)
[Elapsed time: 9.00 seconds]
modified2015-04-20 07:32:10
created2015-01-06 18:11:01
id164661

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