42530119784448 · 2969# + 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 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:	42530119784448 · 2969# + 1
Verification status (*):	Proven
Official Comment (*):	Cunningham chain 2nd kind (16p-15)
Proof-code(s): (*):	p382 : Oestlin, NewPGen, OpenPFGW
Decimal Digits:	1281 (log₁₀ is 1280.1862421654)
Rank (*):	115232 (digit rank is 62)
Entrance Rank (*):	100382
Currently on list? (*):	yes
Submitted:	7/1/2017 14:51:48 UTC
Last modified:	5/20/2023 20:59:19 UTC
Database id:	123634
Status Flags:	none
Score (*):	26.0444 (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.

Cunningham Chains (2nd kind) (archivable class *)
Prime on list: yes, rank 3, weight 47.001975281781
Subcategory: "Cunningham chain 2nd kind (16p-15)"
(archival tag id 218773, tag last modified 2023-03-11 15:53:59)

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 123634

person_id 9

machine Using: Xeon (pool) 4c+4c 3.5GHz

what prime

notes Command: /home/caldwell/clientpool/1/pfgw64 -t -q"2658132486528*2969#*16+1" 2>&1 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] Primality testing 2658132486528*2969#*16+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 2971 Running N-1 test using base 3001 Calling Brillhart-Lehmer-Selfridge with factored part 33.42% 2658132486528*2969#*16+1 is prime! (0.4089s+0.0004s) [Elapsed time: 0.00 seconds]

modified 2020-07-07 22:30:15

created 2017-07-01 14:53:04

id 169286

field	value
prime_id	123634
person_id	9
machine	Using: Xeon (pool) 4c+4c 3.5GHz
what	prime
notes	Command: /home/caldwell/clientpool/1/pfgw64 -t -q"26581324865282969#16+1" 2>&1 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] Primality testing 26581324865282969#16+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 2971 Running N-1 test using base 3001 Calling Brillhart-Lehmer-Selfridge with factored part 33.42% 26581324865282969#16+1 is prime! (0.4089s+0.0004s) [Elapsed time: 0.00 seconds]
modified	2020-07-07 22:30:15
created	2017-07-01 14:53:04
id	169286

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