87 · 21891391 + 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:||87 · 21891391 + 1|
|Verification status (*):||Proven|
|Official Comment (*):||[none]|
|Unofficial Comments:||This prime has 1 user comment below.|
|Proof-code(s): (*):||L2673 : Burningham, PSieve, Srsieve, PrimeGrid, LLR|
|Decimal Digits:||569368 (log10 is 569367.36404815)|
|Rank (*):||4021 (digit rank is 1)|
|Entrance Rank (*):||114|
|Currently on list? (*):||yes|
|Submitted:||9/10/2011 18:42:17 CDT|
|Last modified:||9/11/2011 18:20:03 CDT|
|Score (*):||44.9041 (normalized score 1.2264)|
User comments about this prime (disclaimer):
User comments are allowed to convey mathematical information about this number, how it was proven prime.... See our guidelines and restrictions.
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 101923 person_id 9 machine RedHat P4 P4 what trial_divided notes Command: /home/caldwell/client/TrialDiv/TrialDiv -q 87 2 1891391 1 2>&1 [Elapsed time: 10.450 seconds] modified 2020-07-07 17:30:30 created 2011-09-10 18:48:01 id 133412
field value prime_id 101923 person_id 9 machine RedHat Virtual STEM Server what prime notes Command: /home/caldwell/client/pfgw -t -q"87*2^1891391+1" 2>&1 PFGW Version 188.8.131.5200405.x86_Stable [GWNUM 25.14] Primality testing 87*2^1891391+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 87*2^1891391+1 is prime! (4959.7893s+0.0604s) [Elapsed time: 82.67 minutes] modified 2020-07-07 17:30:30 created 2011-09-10 18:53:01 id 133414