U(42829)/107130175995197969243646842778153077
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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(42829)/107130175995197969243646842778153077
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:8916   (log10 is 8915.3522474458)
Rank (*):74064 (digit rank is 3)
Entrance Rank (*):68102
Currently on list? (*):short
Submitted:4/25/2014 06:48:09 CDT
Last modified:4/25/2014 07:22:37 CDT
Database id:117721
Status Flags:Verify, TrialDiv
Score (*):32.0842 (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 188
Subcategory: "ECPP"
(archival tag id 217683, tag last modified 2017-11-27 10:20:19)
Fibonacci cofactor (archivable *)
Prime on list: yes, rank 8
Subcategory: "Fibonacci cofactor"
(archival tag id 217684, 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 (11 Sep 2014): 
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_id117721
person_id9
machineWinXP Dual Core 2.6GHz 32-bit
whatprp
notesCommand: pfgw32.exe -tc -q"U(42829)/107130175995197969243646842778153077" 2>&1
PFGW Version 3.7.3.32BIT.20130210.Win_Dev [GWNUM 27.8]
Primality testing U(42829)/1071301759...2778153077 [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 0.23% and helper 0.02% (0.71% proof)
U(42829)/1071301759...2778153077 is Fermat and Lucas PRP! (21.4698s+0.0540s)
[Elapsed time: 22 seconds]
modified2014-06-21 13:36:26
created2014-04-25 07:20:15
id163265

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.