(V(21151, 1, 3777) - 1)/(V(21151, 1, 3) - 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:(V(21151, 1, 3777) - 1)/(V(21151, 1, 3) - 1)
Verification status (*):PRP
Official Comment:Lehmer primitive part
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):x25 : Water, Broadhurst, Primo, OpenPFGW
Decimal Digits:16324   (log10 is 16323.798832726)
Rank (*):66335 (digit rank is 1)
Entrance Rank (*):46808
Currently on list? (*):short
Submitted:5/28/2011 00:59:14 CDT
Last modified:5/28/2011 01:20:29 CDT
Database id:100216
Status Flags:Verify
Score (*):33.9578 (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.
Lehmer primitive part (archivable *)
Prime on list: yes, rank 9
Subcategory: "Lehmer primitive part"
(archival tag id 213251, tag last modified 2016-06-14 19:50:41)

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): 
KP proof

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_id100216
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/pfgw -o -f -q"(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1)" 2>&1
PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5]
(lucasV(21151,1,....sV(21151,1,3)-1) 1/1 mro=0


trial factoring to 4876437
(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1) has no small factor.
[Elapsed time: 6.917 seconds]
modified2011-12-27 16:48:32
created2011-05-28 01:05:02
id130002

fieldvalue
prime_id100216
person_id9
machineDitto P4 P4
whatprp
notesCommand: /home/ditto/client/pfgw -tc -q"(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1)" 2>&1
PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5]
Primality testing (lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1) [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N-1 test using base 37
Running N+1 test using discriminant 61, base 12+sqrt(61)
Calling N-1 BLS with factored part 1.73% and helper 0.05% (5.23% proof)
(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1) is Fermat and Lucas PRP! (150.5290s+0.0027s)
[Elapsed time: 2.52 minutes]
modified2011-12-27 16:48:32
created2011-05-28 01:08:01
id130003

Query times: 0.0008 seconds to select prime, 0.0006 seconds to seek comments.