24518262144 + 1
(Another of the Prime Pages' resources)
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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:24518262144 + 1
Verification status (*):Proven
Official Comment:Generalized Fermat
Proof-code(s): (*):g413 : Scott, AthGFNSieve, Proth.exe
Decimal Digits:1150678   (log10 is 1150677.1665114)
Rank (*):170 (digit rank is 1)
Entrance Rank (*):13
Currently on list? (*):short
Submitted:3/12/2008 18:42:49 CDT
Last modified:3/17/2008 08:51:23 CDT
Database id:84401
Status Flags:none
Score (*):47.0636 (normalized score 23.3672)

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.
Generalized Fermat (archivable *)
Prime on list: no, rank 36
Subcategory: "Generalized Fermat"
(archival tag id 204694, tag last modified 2018-11-04 07:50:11)

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 1 24518 262144 1 2>&1
[Elapsed time: 8.792 seconds]
modified2011-12-27 16:48:47
created2008-03-12 18:52:01

machineRedHat P4 P4
notesCommand: /home/caldwell/client/pfgw -t -q"24518^262144+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 24518^262144+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(524288,19) to FFT(524288,18)
Reduced from FFT(524288,18) to FFT(524288,17)
Reduced from FFT(524288,17) to FFT(524288,16)
7644942 bit request FFT size=(524288,16)
Calling Brillhart-Lehmer-Selfridge with factored part 36.74%
24518^262144+1 is prime! (318284.7282s+0.3142s)
[Elapsed time: 3.68 days]
modified2008-04-18 10:43:09
created2008-03-12 18:53:01

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