4788920 · 39577840 - 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: | 4788920 · 39577840 - 1 |
|---|---|
| Verification status (*): | Proven |
| Official Comment (*): | Generalized Woodall |
| Unofficial Comments: | This prime has 1 user comment below. |
| Proof-code(s): (*): | A20 : Propper, Batalov, Gcwsieve, PRST |
| Decimal Digits: | 4569798 (log10 is 4569797.7185418) |
| Rank (*): | 62 (digit rank is 1) |
| Entrance Rank (*): | 52 |
| Currently on list? (*): | yes |
| Submitted: | 2/14/2024 17:00:06 UTC |
| Last modified: | 2/26/2024 15:37:16 UTC |
| Database id: | 137390 |
| Status Flags: | none |
| Score (*): | 51.2901 (normalized score 473.3383) |
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 Woodall (archivable *)
- Prime on list: yes, rank 4
Subcategory: "Generalized Woodall"
(archival tag id 229390, tag last modified 2024-11-17 07:37:11)
User comments about this prime (disclaimer):
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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 137390 person_id 9 machine Using: Digital Ocean Droplet what prime notes Command: /var/www/clientpool/1/pfgw64 -V -f -tp -q"4788920*3^9577840-1" >command_output 2>&1
PFGW Version 4.0.4.64BIT.20221214.x86_Dev [GWNUM 30.11]
Primality testing 4788920*3^9577840-1 [N+1, Brillhart-Lehmer-Selfridge]
trial
Running N+1 test using discriminant 7, base 1+sqrt(7)
Special modular reduction using zero-padded FMA3 FFT length 1600K, Pass1=640, Pass2=2560, clm=1 on 4788920*3^9577840-1
Detected in MAXERR>0.45 (round off check) in Exponentiator::Iterate
Iteration: 55187/15180540 ERROR: ROUND OFF 0.4661>0.45
(Test aborted, try again using the -a1 switch)
Running N+1 test using discriminant 7, base 1+sqrt(7)
Special modular reduction using zero-padded FMA3 FFT length 1680K, Pass1=448, Pass2=3840, clm=2 on 4788920*3^9577840-1
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
4788920*3^9577840-1 is prime! (998744.3377s+0.0778s)
[Elapsed time: 11.56 days]modified 2024-02-26 15:24:23 created 2024-02-15 01:58:37 id 183232
Query times: 0.0003 seconds to select prime, 0.0003 seconds to seek comments.
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