849 · 2478885 + 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:849 · 2478885 + 1
Verification status (*):Proven
Official Comment:
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):L670 : McKibbon, Srsieve, PrimeGrid, LLR
Decimal Digits:144162   (log10 is 144161.67838124)
Rank (*):35518 (digit rank is 1)
Entrance Rank (*):2062
Currently on list? (*):no
Submitted:12/30/2008 00:01:28 CDT
Last modified:1/1/2009 23:23:14 CDT
Removed (*):1/16/2010 15:05:43 CDT
Database id:86077
Status Flags:none
Score (*):40.6807 (normalized score 0.0306)

User comments about this prime (disclaimer):

User comments are allowed to convey mathematical information about this number, how it was proven prime.... See our guidelines and restrictions.

Patrick W. McKibbon writes (11 Sep 2014): 
Divides GF(478884,11)

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 849 2 478885 1 2>&1
[Elapsed time: 9.739 seconds]
modified2011-12-27 16:48:46
created2008-12-30 00:05:01

machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -t -q"849*2^478885+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 849*2^478885+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(57344,20) to FFT(57344,19)
Reduced from FFT(57344,19) to FFT(57344,18)
Reduced from FFT(57344,18) to FFT(57344,17)
957798 bit request FFT size=(57344,17)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
849*2^478885+1 is prime! (1158.8400s+0.0000s)
[Elapsed time: 20.17 minutes]
modified2009-02-05 12:51:35
created2008-12-30 00:08:01

Query times: 0.0004 seconds to select prime, 0.0007 seconds to seek comments.