391 · 21886863 - 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.
|Description:||391 · 21886863 - 1|
|Verification status (*):||Proven|
|Official Comment (*):||[none]|
|Proof-code(s): (*):||L1809 : Vogel, PSieve, Srsieve, NPLB, LLR|
|Decimal Digits:||568005 (log10 is 568004.95288528)|
|Rank (*):||3498 (digit rank is 1)|
|Entrance Rank (*):||627|
|Currently on list? (*):||yes|
|Submitted:||8/11/2014 13:58:56 CDT|
|Last modified:||8/11/2014 14:21:47 CDT|
|Score (*):||44.8967 (normalized score 1.3528)|
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 118327 person_id 9 machine Xeon 4c+4c 3.5GHz what prime notes Command: /home/caldwell/client/llr.pl 391*2^1886863-1 2>&1 Starting Lucas Lehmer Riesel prime test of 391*2^1886863-1 Using AVX FFT length 120K, Pass1=384, Pass2=320 V1 = 4 ; Computing U0... V1 = 4 ; Computing U0...done.Starting Lucas-Lehmer loop... 391*2^1886863-1 is prime! (568005 decimal digits) Time : 1092.188 sec. [Elapsed time: 18.20 minutes] modified 2020-07-07 17:30:17 created 2014-08-11 14:01:01 id 163898