445 · 21328250 + 1
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
 

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:445 · 21328250 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L1533 : Heinicken, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:399846   (log10 is 399845.74010069)
Rank (*):4509 (digit rank is 1)
Entrance Rank (*):401
Currently on list? (*):yes
Submitted:1/12/2012 19:56:20 CDT
Last modified:1/12/2012 20:50:24 CDT
Database id:103919
Status Flags:none
Score (*):43.8183 (normalized score 1.0808)

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_id103919
person_id9
machineRedHat Virtual STEM Server
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"445*2^1328250+1" 2>&1
PFGW Version 3.3.4.20100405.x86_Stable [GWNUM 25.14]
Primality testing 445*2^1328250+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
445*2^1328250+1 is prime! (2313.5014s+0.0568s)
[Elapsed time: 38.72 minutes]
modified2012-02-19 19:07:48
created2012-01-12 19:59:56
id137427

fieldvalue
prime_id103919
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 445 2 1328250 1 2>&1
[Elapsed time: 9.869 seconds]
modified2012-02-19 19:07:48
created2012-01-12 20:05:02
id137428

Query times: 0.0004 seconds to select prime, 0.0005 seconds to seek comments.