(17887525 - 1)2 - 2
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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:(17887525 - 1)2 - 2
Verification status (*):Proven
Official Comment:
Unofficial Comments:This prime has 2 user comments below.
Proof-code(s): (*):p392 : Batalov, Cksieve, OpenPFGW
Decimal Digits:393937   (log10 is 393936.021404172)
Rank (*):5810 (digit rank is 1)
Entrance Rank (*):3654
Currently on list? (*):no
Submitted:5/21/2016 10:27:44 CDT
Last modified:5/21/2016 17:35:08 CDT
Removed (*):1/19/2018 16:15:38 CDT
Database id:121680
Status Flags:TrialDiv
Score (*):43.7726 (normalized score 0.886)

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.

Serge Batalov writes (21 May 2016): 
Carol prime, near square

David Broadhurst writes (15 Jun 2016): 
Arbitrarily dubbed a Carol prime by the original investigator in reference to a personal acquaintance. Several people have deprecated this practice.

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_id121680
person_id9
machineUsing: Xeon 4c+4c 3.5GHz
whatprime
notesCommand: /home/caldwell/client/pfgw/pfgw64 -tc -q"(178^87525-1)^2-2" 2>&1
PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11]
Primality testing (178^87525-1)^2-2 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 5
Running N+1 test using discriminant 13, base 2+sqrt(13)
Running N+1 test using discriminant 13, base 3+sqrt(13)
Calling N+1 BLS with factored part 50.00% and helper 0.00% (150.01% proof)


(178^87525-1)^2-2 is prime! (24436.9732s+0.0114s)
[Elapsed time: 6.79 hours]
modified2017-01-27 05:57:11
created2016-05-21 10:31:02
id167318

Query times: 0.0004 seconds to select prime, 0.0009 seconds to seek comments.