Phi(5655, 34120)/(64772371 · 35066801243156348783521)
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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:Phi(5655, 34120)/(64772371 · 35066801243156348783521)
Verification status (*):PRP
Official Comment:ECPP
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):c54 : Wu_T, Primo
Decimal Digits:12155   (log10 is 12154.371966521)
Rank (*):65850 (digit rank is 2)
Entrance Rank (*):52260
Currently on list? (*):no
Submitted:9/1/2011 14:53:37 CDT
Last modified:9/1/2011 15:50:25 CDT
Database id:101438
Status Flags:Verify
Score (*):33.0446 (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 49
Subcategory: "ECPP"
(archival tag id 213408, tag last modified 2014-09-29 10:20:17)

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.

Tom Wu writes (11 Sep 2014): 
This prime is a helper for the CHG primality proof of the GRU prime N=Phi(11311,34120), providing 23.7% of the factorization of N-1.

The Primo certificate is available at: http://www.ellipsa.eu/public/primo/files/ecpp12155.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_id101438
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/pfgw -o -f -q"Phi(5655,34120)/(64772371*35066801243156348783521)" 2>&1
PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5]
Phi(5655,34120)/....243156348783521) 1/1 mro=0


trial factoring to 3547487
Phi(5655,34120)/(64772371*3506680124...6348783521) has no small factor.
[Elapsed time: 3.818 seconds]
modified2011-12-27 16:48:29
created2011-09-01 15:05:01
id132442

fieldvalue
prime_id101438
person_id9
machineRedHat Virtual STEM Server
whatprp
notesCommand: /home/caldwell/client/pfgw -tc -q"Phi(5655,34120)/(64772371*35066801243156348783521)" 2>&1
PFGW Version 3.3.4.20100405.x86_Stable [GWNUM 25.14]
Primality testing Phi(5655,34120)/(64772371*3506680124...6348783521) [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 3
Running N-1 test using base 7
Running N+1 test using discriminant 19, base 18+sqrt(19)
Calling N-1 BLS with factored part 0.08% and helper 0.00% (0.24% proof)
Phi(5655,34120)/(64772371*3506680124...6348783521) is Fermat and Lucas PRP! (40.2708s+0.0131s)
[Elapsed time: 40.00 seconds]
modified2011-12-27 16:48:29
created2011-09-01 15:22:30
id132444

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