129897 · 68129897 + 1

At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly.  This list is the most important PrimePages database: a collection of research, records and results all about prime numbers. This page summarizes our information about one of these primes.

Description:129897 · 68129897 + 1
Verification status (*):Proven
Official Comment (*):Generalized Cullen
Proof-code(s): (*):p277 : Kaiser1, Gcwsieve, MultiSieve, PrimeGrid, OpenPFGW
Decimal Digits:238043   (log10 is 238042.52383292)
Rank (*):23723 (digit rank is 2)
Entrance Rank (*):851
Currently on list? (*):no
Submitted:5/25/2010 15:25:51 CDT
Last modified:5/25/2010 17:50:21 CDT
Database id:92856
Status Flags:none
Score (*):42.224 (normalized score 0.0936)

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 Cullen (archivable *)
Prime on list: no, rank 34
Subcategory: "Generalized Cullen"
(archival tag id 210696, tag last modified 2021-09-01 15:37:16)

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/pfgw -t -q"129897*68^129897+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 129897*68^129897+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(98304,20) to FFT(98304,19) Reduced from FFT(98304,19) to FFT(98304,18) Reduced from FFT(98304,18) to FFT(98304,17) 1581530 bit request FFT size=(98304,17) Calling Brillhart-Lehmer-Selfridge with factored part 67.14% 129897*68^129897+1 is prime! (-679.9246s+0.0400s) [Elapsed time: 2.22 hours]
modified2020-07-07 17:30:34
created2010-05-25 15:31:42

machineDitto P4 P4
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 129897 68 129897 1 2>&1 [Elapsed time: 9.193 seconds]
modified2020-07-07 17:30:34
created2010-05-25 15:35:01

Query times: 0.0003 seconds to select prime, 0.0004 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.