1807 · 2700348 + 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:1807 · 2700348 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1158 : Vogel, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:210830   (log10 is 210829.01236143)
Rank (*):23598 (digit rank is 1)
Entrance Rank (*):1030
Currently on list? (*):no
Submitted:1/25/2010 18:32:03 CDT
Last modified:1/25/2010 19:50:20 CDT
Removed (*):2/14/2012 08:51:14 CDT
Database id:91538
Status Flags:none
Score (*):41.8505 (normalized score 0.0956)

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_id91538
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 1807 2 700348 1 2>&1 [Elapsed time: 10.401 seconds]
modified2020-07-07 17:30:36
created2010-01-25 18:35:01
id112451

fieldvalue
prime_id91538
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"1807*2^700348+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 1807*2^700348+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(98304,20) to FFT(98304,19) Reduced from FFT(98304,19) to FFT(98304,18) Reduced from FFT(98304,18) to FFT(98304,17) Reduced from FFT(98304,17) to FFT(98304,16) 1400726 bit request FFT size=(98304,16) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 1807*2^700348+1 is prime! (-1173.2573s+0.0000s) [Elapsed time: 52.22 minutes]
modified2020-07-07 17:30:36
created2010-01-25 18:53:02
id112452

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