262419 · 2262419 + 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:262419 · 2262419 + 1
Verification status (*):Proven
Official Comment:Cullen
Proof-code(s): (*):DS : Smith_Darren, Proth.exe
Decimal Digits:79002   (log10 is 79001.4094274225)
Rank (*):44347 (digit rank is 1)
Entrance Rank (*):8
Currently on list? (*):short
Submitted:3/8/1998 17:57:01 CDT
Last modified:3/8/1998 17:57:01 CDT
Database id:271
Status Flags:none
Score (*):38.8278 (normalized score 0.0072)

Archival tags:

There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper.  Such primes are tracked with archival tags.
Cullen primes (archivable *)
Prime on list: yes, rank 6
Subcategory: "Cullen primes"
(archival tag id 188565, tag last modified 2009-08-04 21:58:38)

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_id271
person_id9
machineWinXP P4 1.8GHz
whatprime
notesPFGW Version 20021217.Win_Dev (Beta 'caveat utilitor') [FFT v22.7 w/P4] Running N-1 test using base 5 Primality testing 262419*2^262419+1 [N-1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 99.99% 262419*2^262419+1 is prime! (492.016000 seconds)
modified2003-03-25 11:21:48
created2003-01-22 12:07:28
id67284

Query times: 0.0014 seconds to select prime, 0.0006 seconds to seek comments.