25 · 28456828 + 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:||25 · 28456828 + 1|
|Verification status (*):||Proven|
|Official Comment (*):||Divides GF(8456827,12), generalized Fermat|
|Unofficial Comments:||This prime has 1 user comment below.|
|Proof-code(s): (*):||L5237 : Schwieger, LLR2, PSieve, Srsieve, PrimeGrid, LLR|
|Decimal Digits:||2545761 (log10 is 2545760.294111)|
|Rank (*):||132 (digit rank is 1)|
|Entrance Rank (*):||74|
|Currently on list? (*):||short|
|Submitted:||1/28/2021 08:50:13 CDT|
|Last modified:||1/28/2021 16:20:24 CDT|
|Score (*):||49.4981 (normalized score 121.7269)|
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: no, rank 27
Subcategory: "Generalized Fermat"
(archival tag id 225812, tag last modified 2022-12-20 18:37:13)
- Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
- Prime on list: yes, rank 2, weight 52.7170358442
Subcategory: "Divides GF(*,12)"
(archival tag id 225813, tag last modified 2021-01-28 16:20:30)
User comments about this prime (disclaimer):
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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 131626 person_id 9 machine Using: Xeon 4c+4c 3.5GHz what prime notes Command: /home/caldwell/client/pfgw/pfgw64 -t -q"25*2^8456828+1" 2>&1 PFGW Version 220.127.116.11BIT.20191203.x86_Dev [GWNUM 29.8] Primality testing 25*2^8456828+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 25*2^8456828+1 is prime! (26025.0625s+0.0015s) [Elapsed time: 7.23 hours] modified 2021-04-20 17:39:25 created 2021-01-28 09:01:01 id 177322