81 · 220498148 + 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.

This prime's information:

Description:81 · 220498148 + 1
Verification status (*):Proven
Official Comment (*):Generalized Fermat
Proof-code(s): (*):L4965 : Propper, LLR
Decimal Digits:6170560   (log10 is 6170559.3120447)
Rank (*):22 (digit rank is 1)
Entrance Rank (*):20
Currently on list? (*):short
Submitted:6/13/2023 12:33:12 UTC
Last modified:6/17/2023 07:37:19 UTC
Database id:136165
Status Flags:none
Score (*):52.2094 (normalized score 1340.4595)

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.
Generalized Fermat (archivable *)
Prime on list: yes, rank 5
Subcategory: "Generalized Fermat"
(archival tag id 228633, tag last modified 2023-06-17 07:37:21)

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_id136165
person_id9
machineUsing: Digital Ocean Droplet
whatprime
notesCommand: /var/www/clientpool/1/pfgw64 -V -f -t -q"81*2^20498148+1" 2>&1
PFGW Version 4.0.4.64BIT.20221214.x86_Dev [GWNUM 30.11]
Primality testing 81*2^20498148+1 [N-1, Brillhart-Lehmer-Selfridge]
trial


Running N-1 test using base 5
Special modular reduction using all-complex FMA3 FFT length 1280K, Pass1=512, Pass2=2560, clm=2 on 81*2^20498148+1
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%


81*2^20498148+1 is prime! (315077.3713s+0.0071s)
[Elapsed time: 3.65 days]
modified2023-06-17 06:39:27
created2023-06-13 15:08:10
id181999

Query times: 0.0004 seconds to select prime, 0.0004 seconds to seek comments.
Printed from the PrimePages <t5k.org> © Reginald McLean.