285 · 21563167 - 1
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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:285 · 21563167 - 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L3202 : Sharma, PSieve, Rieselprime, LLR
Decimal Digits:470563   (log10 is 470562.61007694)
Rank (*):2222 (digit rank is 1)
Entrance Rank (*):637
Currently on list? (*):yes
Submitted:4/3/2013 03:10:47 CDT
Last modified:4/3/2013 05:20:27 CDT
Database id:112290
Status Flags:none
Score (*):44.3187 (normalized score 1.7828)

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_id112290
person_id9
machineRedHat P4 P4
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 285 2 1563167 -1 2>&1
[Elapsed time: 10.822 seconds]
modified2013-04-08 09:17:46
created2013-04-03 03:18:12
id154927

fieldvalue
prime_id112290
person_id9
machineDitto P4 P4
whatprime
notesCommand: /home/ditto/client/llr.pl 285*2^1563167-1 2>&1
Starting Lucas Lehmer Riesel prime test of 285*2^1563167-1
Using Irrational Base DWT : Mersenne fftlen = 81920, Used fftlen = 98304
V1 = 9 ; Computing U0...
V1 = 9 ; Computing U0...done.
Starting Lucas-Lehmer loop...

285*2^1563167-1 is prime! Time : 4714.260 sec.
[Elapsed time: 78.57 minutes]
modified2013-04-08 09:17:46
created2013-04-03 03:38:16
id154929

Query times: 0.0002 seconds to select prime, 0.0002 seconds to seek comments.