81 · 22468789 + 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:81 · 22468789 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):g418 : Taura, NewPGen, PRP, Proth.exe
Decimal Digits:743182   (log10 is 743181.4504503)
Rank (*):594 (digit rank is 1)
Entrance Rank (*):44
Currently on list? (*):short
Submitted:9/12/2009 02:37:28 CDT
Last modified:9/12/2009 16:50:21 CDT
Database id:89941
Status Flags:none
Score (*):45.7221 (normalized score 7.2544)

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_id89941
person_id9
machineRedHat P4 P4
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 81 2 2468789 1 2>&1
[Elapsed time: 11.304 seconds]
modified2011-12-27 16:48:42
created2009-09-12 02:48:01
id109256

fieldvalue
prime_id89941
person_id9
machineDitto P4 P4
whatprime
notesCommand: /home/ditto/client/pfgw -t -q"81*2^2468789+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 81*2^2468789+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(327680,19) to FFT(327680,18)
Reduced from FFT(327680,18) to FFT(327680,17)
Reduced from FFT(327680,17) to FFT(327680,16)
4937600 bit request FFT size=(327680,16)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
81*2^2468789+1 is prime! (-1524.3876s+0.0000s)
[Elapsed time: 14.00 hours]
modified2009-11-24 13:57:51
created2009-09-12 02:38:02
id109255

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.