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291 · 21257405 - 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:291 · 21257405 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2338 : Burt, PSieve, Srsieve, Rieselprime, LLR
Decimal Digits:378520   (log10 is 378519.08559086)
Rank (*):11697 (digit rank is 1)
Entrance Rank (*):786
Currently on list? (*):no
Submitted:5/7/2012 16:33:48 CDT
Last modified:5/7/2012 17:50:25 CDT
Removed (*):4/26/2015 04:20:48 CDT
Database id:106853
Status Flags:none
Score (*):43.6499 (normalized score 0.5829)

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_id106853
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 291 2 1257405 -1 2>&1
[Elapsed time: 10.763 seconds]
modified2012-07-16 11:33:00
created2012-05-07 16:35:01
id143294

fieldvalue
prime_id106853
person_id9
machineDitto P4 P4
whatprime
notesCommand: /home/ditto/client/llr.pl 291*2^1257405-1 2>&1
Starting Lucas Lehmer Riesel prime test of 291*2^1257405-1
Using Irrational Base DWT : Mersenne fftlen = 65536, Used fftlen = 81920
V1 = 9 ; Computing U0...
V1 = 9 ; Computing U0...done.
Starting Lucas-Lehmer loop...

291*2^1257405-1 is prime! Time : 3116.441 sec.
[Elapsed time: 51.95 minutes]
modified2012-07-16 11:33:00
created2012-05-07 16:38:01
id143295

Query times: 0.0004 seconds to select prime, 0.0005 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.