225 · 2988695 + 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:225 · 2988695 + 1
Verification status (*):Proven
Official Comment (*):Divides GF(988693,6)
Proof-code(s): (*):L1446 : Harvey, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:297630   (log10 is 297629.20374552)
Rank (*):17820 (digit rank is 1)
Entrance Rank (*):421
Currently on list? (*):no
Submitted:9/17/2010 22:36:16 CDT
Last modified:9/18/2010 00:20:29 CDT
Database id:94998
Status Flags:none
Score (*):42.9109 (normalized score 0.2193)

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 Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: no, rank 22, weight 48.327068300095
Subcategory: "Divides GF(*,6)"
(archival tag id 210841, tag last modified 2021-01-15 14:20:13)

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.
machineDitto P4 P4
notesCommand: /home/ditto/client/pfgw -t -q"225*2^988695+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 225*2^988695+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 11 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(131072,20) to FFT(131072,19) Reduced from FFT(131072,19) to FFT(131072,18) Reduced from FFT(131072,18) to FFT(131072,17) Reduced from FFT(131072,17) to FFT(131072,16) 1977414 bit request FFT size=(131072,16) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 225*2^988695+1 is prime! (5935.2469s+0.0009s) [Elapsed time: 1.65 hours]
modified2020-07-07 17:30:33
created2010-09-17 22:38:01

machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 225 2 988695 1 2>&1 [Elapsed time: 10.156 seconds]
modified2020-07-07 17:30:33
created2010-09-17 22:48:01

Query times: 0.0005 seconds to select prime, 0.0007 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.