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Already Deleted: 263 · 21587306 - 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:263 · 21587306 - 1
Verification status (*):Composite
Official Comment (*):[none]
Proof-code(s): (*):L2101 :

Warning! This is the code this prime was submitted with, but the current owners of the code may have changed. Do not assume this entry was submitted by the owners of this code.

Decimal Digits:477830   (log10 is 477829.13825316)
Rank (*):296 (digit rank is 1)
Entrance Rank (*):296
Currently on list? (*):yes
Submitted:8/28/2012 07:00:53 CDT
Last modified:8/28/2012 08:39:57 CDT
Database id:108985
Status Flags:Rerank, Verify
Score (*):44.3658 (normalized score 1.1927)

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/TrialDiv/TrialDiv -q 263 2 1587306 -1 2>&1
[Elapsed time: 10.062 seconds]
modified2012-09-15 19:04:20
created2012-08-28 07:05:01

machineDitto P4 P4
notesCommand: /home/ditto/client/ 263*2^1587306-1 2>&1
Starting Lucas Lehmer Riesel prime test of 263*2^1587306-1
Using Irrational Base DWT : Mersenne fftlen = 81920, Used fftlen = 114688
V1 = 4 ; Computing U0...
V1 = 4 ; Computing U0...done.
Starting Lucas-Lehmer loop...

263*2^1587306-1 is not prime. LLR Res64: 6A13CCC162AEDBA1 Time : 5515.261 sec.
[Elapsed time: 1.53 hours]
modified2012-09-15 19:04:20
created2012-08-28 07:08:02

Query times: 0.0008 seconds to select prime, 0.0008 seconds to seek comments.
Printed from the PrimePages <> © Chris Caldwell.