417643 · 21800787 - 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:417643 · 21800787 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L134 : Childers, ProthSieve, RieselSieve, LLR
Decimal Digits:542097   (log10 is 542096.52360696)
Rank (*):3939 (digit rank is 1)
Entrance Rank (*):20
Currently on list? (*):yes
Submitted:10/5/2005 10:18:46 CDT
Last modified:10/5/2005 18:11:37 CDT
Database id:75830
Status Flags:none
Score (*):44.7534 (normalized score 1.1281)

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.
machineLinux P4 2.8GHz
notesCommand: /home/caldwell/client/llr.pl 417643*2^1800787-1 2>&1 Starting Lucas Lehmer Riesel prime test of 417643*2^1800787-1 V1 = 4 ; Computing U0... Done Computing U0. Starting Lucas-Lehmer loop... 417643*2^1800787-1 is prime! Time : 28116.116 sec. [Elapsed time: 28116 seconds]
modified2020-07-07 17:30:43
created2005-10-05 10:23:01

Query times: 0.0003 seconds to select prime, 0.0004 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.