15877# - 1

Previous Next Random

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.

This prime's information:

Description:	15877# - 1
Verification status (*):	Proven
Official Comment (*):	Primorial
Unofficial Comments:	This prime has 1 user comment below.
Proof-code(s): (*):	CD : Caldwell, Dubner, Cruncher
Decimal Digits:	6845 (log₁₀ is 6844.9185759399)
Rank (*):	87855 (digit rank is 1)
Entrance Rank (*):	79
Currently on list? (*):	short
Submitted:	12/2/1992 05:59:59 UTC
Last modified:	3/11/2023 15:54:10 UTC
Database id:	21658
Status Flags:	none
Score (*):	31.2644 (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.

Primorial (archivable *)
Prime on list: yes, rank 11
Subcategory: "Primorial"
(archival tag id 194773, tag last modified 2023-03-11 15:53:59)

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.

Chris Caldwell writes (11 Sep 2014): (report abuse)

For more information see [Caldwell95].

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.

field value

prime_id 21658

person_id 9

machine Windows XP P4 1.8GHz

what prime

notes Primality testing 15877#-1 [N+1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 33.34% 15877#-1 is prime! (325.337000 seconds) PFGW Version 20021217.Win_Dev (Beta 'caveat utilitor') [FFT v22.7 w/P4] Running N+1 test using discriminant 3, base 3+sqrt(3) Running N+1 test using discriminant 3, base 5+sqrt(3)

modified 2003-03-25 17:23:47

created 2002-12-27 21:16:13

id 53419

field	value
prime_id	21658
person_id	9
machine	Windows XP P4 1.8GHz
what	prime
notes	Primality testing 15877#-1 [N+1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 33.34% 15877#-1 is prime! (325.337000 seconds) PFGW Version 20021217.Win_Dev (Beta 'caveat utilitor') [FFT v22.7 w/P4] Running N+1 test using discriminant 3, base 3+sqrt(3) Running N+1 test using discriminant 3, base 5+sqrt(3)
modified	2003-03-25 17:23:47
created	2002-12-27 21:16:13
id	53419

Query times: 0.0002 seconds to select prime, 0.0003 seconds to seek comments.