19911001 · 2404076 + 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:19911001 · 2404076 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):g369 : Tamai, Proth.exe
Decimal Digits:121647   (log10 is 121646.295621013)
Rank (*):35592 (digit rank is 1)
Entrance Rank (*):378
Currently on list? (*):no
Submitted:1/2/2005 13:23:07 CDT
Last modified:1/2/2005 13:23:07 CDT
Removed (*):5/21/2009 08:35:00 CDT
Database id:72969
Status Flags:none
Score (*):40.1578 (normalized score 0.028)

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_id72969
person_id9
machineLinux P4 2.8GHz
whatprime
notesCommand: /home/caldwell/client/pfgw -f -t -q"19911001*2^404076+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 19911001*2^404076+1 [N-1, Brillhart-Lehmer-Selfridge]
trial factoring to 42021281
Running N-1 test using base 3
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(49152,20) to FFT(49152,19)
Reduced from FFT(49152,19) to FFT(49152,18)
Reduced from FFT(49152,18) to FFT(49152,17)
808210 bit request FFT size=(49152,17)
Calling Brillhart-Lehmer-Selfridge with factored part 99.99%
19911001*2^404076+1 is prime! (2412.7803s+0.0203s)
modified2005-01-11 16:28:17
created2005-01-02 13:53:00
id77973

Query times: 0.0001 seconds to select prime, 0.0002 seconds to seek comments.