240819405 · 213879 + 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:240819405 · 213879 + 1
Verification status (*):Proven
Official Comment:Cunningham chain 2nd kind (2p-1)
Proof-code(s): (*):g135 : Frind, Proth.exe
Decimal Digits:4187   (log10 is 4186.37700129943)
Rank (*):82196 (digit rank is 1)
Entrance Rank (*):15258
Currently on list? (*):no
Submitted:1/11/2000 03:28:17 CDT
Last modified:1/11/2000 03:28:17 CDT
Database id:27076
Status Flags:none
Score (*):29.7372 (normalized score 0)

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.
Cunningham Chains (2nd kind) (archivable class *)
Prime on list: no, rank 59, weight 29.4593284336599
Subcategory: "Cunningham chain 2nd kind (2p-1)"
(archival tag id 212523, tag last modified 2016-12-03 16:50:32)

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_id27076
person_id9
machineLinux PII 200
whatprime
notesPFGW Version 1.1 for Pentium and compatibles Running N-1 test using base 7 Primality testing 240819405*2^13879+1 [N-1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 99.81% 240819405*2^13879+1 is prime! (18.160000 seconds)
modified2003-03-25 11:26:25
created2002-12-07 07:38:05
id26113

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