(V(21151, 1, 3777) - 1)/(V(21151, 1, 3) - 1)

At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important PrimePages database: a collection of research, records and results all about prime numbers. This page summarizes our information about one of these primes.

Description:(V(21151, 1, 3777) - 1)/(V(21151, 1, 3) - 1)
Verification status (*):PRP
Official Comment (*):Lehmer primitive part
Proof-code(s): (*):x25 : Broadhurst, Water, OpenPFGW, Primo
Decimal Digits:16324   (log10 is 16323.798832726)
Rank (*):71100 (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 12
Subcategory: "Lehmer primitive part"
(archival tag id 213251, tag last modified 2019-08-26 13:20:28)

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.
machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -o -f -q"(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1)" 2>&1 PFGW Version [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]
modified2020-07-07 17:30:31
created2011-05-28 01:05:02

machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -tc -q"(lucasV(21151,1,3777)-1)/(lucasV(21151,1,3)-1)" 2>&1 PFGW Version [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]
modified2020-07-07 17:30:31
created2011-05-28 01:08:01

Query times: 0.0002 seconds to select prime, 0.0364 seconds to seek comments.
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