(20086781 - 1)/2007
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: | (20086781 - 1)/2007 |
|---|---|
| Verification status (*): | PRP |
| Official Comment (*): | Generalized repunit |
| Unofficial Comments: | This prime has 1 user comment below. |
| Proof-code(s): (*): | CH6 : Steward, OpenPFGW, Primo, CHG |
| Decimal Digits: | 22393 (log10 is 22392.738159783) |
| Rank (*): | 72552 (digit rank is 1) |
| Entrance Rank (*): | 38712 |
| Currently on list? (*): | no |
| Submitted: | 10/15/2010 18:31:07 UTC |
| Last modified: | 3/11/2023 15:54:10 UTC |
| Database id: | 95419 |
| Status Flags: | Verify |
| Score (*): | 34.9357 (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.
- Generalized Repunit (archivable *)
- Prime on list: no, rank 37
Subcategory: "Generalized Repunit"
(archival tag id 210857, tag last modified 2024-02-26 02:37:04)
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 95419 person_id 9 machine RedHat P4 P4 what prp notes Command: /home/caldwell/client/pfgw -tc -q"(2008^6781-1)/2007" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing (2008^6781-1)/2007 [N-1/N+1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 17 Running N-1 test using base 29 Running N-1 test using base 47 Running N+1 test using discriminant 59, base 1+sqrt(59) Calling N-1 BLS with factored part 0.33% and helper 0.06% (1.06% proof) (2008^6781-1)/2007 is Fermat and Lucas PRP! (324.9600s+0.0000s) [Elapsed time: 5.50 minutes] modified 2020-07-07 22:30:33 created 2010-10-15 18:34:49 id 120219
field value prime_id 95419 person_id 9 machine Ditto P4 P4 what trial_divided notes Command: /home/ditto/client/pfgw -o -f -q"(2008^6781-1)/2007" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] trial factoring to 6854078 (2008^6781-1)/2007 has no small factor. [Elapsed time: 13.014 seconds] modified 2020-07-07 22:30:33 created 2010-10-15 18:35:16 id 120222
Query times: 0.0002 seconds to select prime, 0.0003 seconds to seek comments.
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