21480! - 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:||21480! - 1|
|Verification status (*):||Proven|
|Official Comment (*):||Factorial|
|Proof-code(s): (*):||p65 : DavisK, Kuosa, OpenPFGW|
|Decimal Digits:||83727 (log10 is 83726.015908027)|
|Rank (*):||51557 (digit rank is 1)|
|Entrance Rank (*):||124|
|Currently on list? (*):||short|
|Submitted:||9/3/2001 08:01:24 UTC|
|Last modified:||3/11/2023 15:54:10 UTC|
|Score (*):||39.0069 (normalized score 0.003)|
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.
- Factorial primes (archivable *)
- Prime on list: yes, rank 12
(archival tag id 188528, tag last modified 2023-03-11 15:53:59)
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 254 person_id 9 machine WinXP P4 1.8GHz what prime notes Primality testing 21480!-1 [N+1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 33.69% 21480!-1 is prime! (14903.664000 seconds) PFGW Version 20021217.Win_Dev (Beta 'caveat utilitor') [FFT v22.7 w/P4] Running N+1 test using discriminant 21487, base 1+sqrt(21487) modified 2003-03-25 17:22:38 created 2003-01-10 09:14:56 id 65066
Query times: 0.0002 seconds to select prime, 0.0003 seconds to seek comments.
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