395 · 21611672 - 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:395 · 21611672 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1819 : Gunn, PSieve, Srsieve, NPLB, LLR
Decimal Digits:485165   (log10 is 485164.21176885)
Rank (*):3915 (digit rank is 1)
Entrance Rank (*):563
Currently on list? (*):yes
Submitted:4/27/2013 06:57:07 CDT
Last modified:4/27/2013 09:20:27 CDT
Database id:113976
Status Flags:none
Score (*):44.4126 (normalized score 1.175)

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.
fieldvalue
prime_id113976
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 395 2 1611672 -1 2>&1 [Elapsed time: 10.428 seconds]
modified2020-07-07 17:30:19
created2013-04-27 07:05:01
id158310

fieldvalue
prime_id113976
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/llr.pl 395*2^1611672-1 2>&1 Starting Lucas Lehmer Riesel prime test of 395*2^1611672-1 Using Irrational Base DWT : Mersenne fftlen = 81920, Used fftlen = 114688 V1 = 4 ; Computing U0... V1 = 4 ; Computing U0...done. Starting Lucas-Lehmer loop... 395*2^1611672-1 is prime! Time : 5788.375 sec. [Elapsed time: 1.61 hours]
modified2020-07-07 17:30:19
created2013-04-27 07:27:08
id158311

Query times: 0.0017 seconds to select prime, 0.0005 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.