20065330973565 · 2666666 - 1
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important databases at The Prime Pages: 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:

field (help)value
Description:20065330973565 · 2666666 - 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L2458 : Khadjiyev, TwinGen, PrimeGrid, LLR
Decimal Digits:200700   (log10 is 200699.76553565)
Rank (*):24900 (digit rank is 774)
Entrance Rank (*):3715
Currently on list? (*):no
Submitted:6/28/2011 20:12:14 CDT
Last modified:6/28/2011 22:20:51 CDT
Removed (*):9/17/2011 08:39:07 CDT
Database id:100645
Status Flags:none
Score (*):41.699 (normalized score 0.0934)

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 P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 20065330973565 2 666666 -1 2>&1
[Elapsed time: 9.805 seconds]
modified2011-12-27 16:48:31
created2011-06-28 20:18:12

machineRedHat Virtual STEM Server
notesCommand: /home/caldwell/client/llr.pl 20065330973565*2^666666-1 2>&1
Starting Lucas Lehmer Riesel prime test of 20065330973565*2^666666-1
Using Zero Padded IBDWT : Mersenne fftlen = 32768, Used fftlen = 81920
V1 = 5 ; Computing U0...
V1 = 5 ; Computing U0...done.Starting Lucas-Lehmer loop...

20065330973565*2^666666-1 is prime! Time : 1139.868 sec.
[Elapsed time: 19.27 minutes]
modified2011-12-27 16:48:31
created2011-06-28 21:31:51

Query times: 0.0005 seconds to select prime, 0.0006 seconds to seek comments.