87 · 21852590 - 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:87 · 21852590 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2055 : Soule, PSieve, Srsieve, Rieselprime, LLR
Decimal Digits:557688   (log10 is 557687.09918639)
Rank (*):3102 (digit rank is 1)
Entrance Rank (*):107
Currently on list? (*):yes
Submitted:7/5/2011 11:10:19 CDT
Last modified:7/5/2011 12:50:23 CDT
Database id:100694
Status Flags:none
Score (*):44.8404 (normalized score 1.4847)

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.
machineRedHat Virtual STEM Server
notesCommand: /home/caldwell/client/llr.pl 87*2^1852590-1 2>&1 Starting Lucas Lehmer Riesel prime test of 87*2^1852590-1 Using Irrational Base DWT : Mersenne fftlen = 98304, Used fftlen = 114688 V1 = 3 ; Computing U0... V1 = 3 ; Computing U0...done.Starting Lucas-Lehmer loop... 87*2^1852590-1 is prime! Time : 3955.975 sec. [Elapsed time: 66.18 minutes]
modified2020-07-07 17:30:31
created2011-07-05 11:15:24

machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 87 2 1852590 -1 2>&1 [Elapsed time: 10.383 seconds]
modified2020-07-07 17:30:31
created2011-07-05 11:18:02

Query times: 0.0006 seconds to select prime, 0.0007 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.