19 · 22206266 + 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:19 · 22206266 + 1
Verification status (*):Proven
Official Comment:
Unofficial Comments:This prime has 1 user comment below.
Proof-code(s): (*):p189 : Bohanon, LLR, OpenPFGW
Decimal Digits:664154   (log10 is 664153.52316719)
Rank (*):950 (digit rank is 1)
Entrance Rank (*):23
Currently on list? (*):short
Submitted:9/15/2006 03:12:42 CDT
Last modified:9/15/2006 16:53:31 CDT
Database id:78496
Status Flags:none
Score (*):45.3769 (normalized score 4.7947)

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.

PrimeGrid writes (11 Sep 2014): 
19*2^2206266+1 Divides xGF(2206264,5,3)

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.
machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 19 2 2206266 1 2>&1
[Elapsed time: 10.265 seconds]
modified2007-03-03 21:00:43
created2006-09-15 03:22:01

machineRedHat P4 P4
notesCommand: /home/caldwell/client/pfgw -t -q"19*2^2206266+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 19*2^2206266+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
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)
4412550 bit request FFT size=(327680,16)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
19*2^2206266+1 is prime! (-482.4903s+0.0000s)
[Elapsed time: 48630 seconds]
modified2007-03-03 21:00:43
created2006-09-15 03:23:01

Query times: 0.0003 seconds to select prime, 0.0003 seconds to seek comments.