25328441915745 · 2666666 - 1
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help

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:25328441915745 · 2666666 - 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L927 : Brown1, TwinGen, PrimeGrid, LLR
Decimal Digits:200700   (log10 is 200699.8666978)
Rank (*):25140 (digit rank is 264)
Entrance Rank (*):4886
Currently on list? (*):no
Submitted:10/14/2011 07:35:48 CDT
Last modified:10/14/2011 08:20:24 CDT
Removed (*):10/26/2011 20:21:31 CDT
Database id:102447
Status Flags:none
Score (*):41.699 (normalized score 0.0835)

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.
machineDitto P4 P4
notesCommand: /home/ditto/client/llr.pl 25328441915745*2^666666-1 2>&1
Starting Lucas Lehmer Riesel prime test of 25328441915745*2^666666-1
Using Zero Padded IBDWT : Mersenne fftlen = 32768, Used fftlen = 65536
V1 = 5 ; Computing U0...
V1 = 5 ; Computing U0...done.
Starting Lucas-Lehmer loop...

25328441915745*2^666666-1 is prime! Time : 1302.566 sec.
[Elapsed time: 21.72 minutes]
modified2011-12-27 16:48:27
created2011-10-14 07:38:01

machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 25328441915745 2 666666 -1 2>&1
[Elapsed time: 9.894 seconds]
modified2011-12-27 16:48:27
created2011-10-14 07:48:02

Query times: 0.0004 seconds to select prime, 0.0005 seconds to seek comments.