6255 · 2851211 + 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:6255 · 2851211 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L3091 : Ridgway, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:256244   (log10 is 256243.83986645)
Rank (*):19125 (digit rank is 1)
Entrance Rank (*):2990
Currently on list? (*):no
Submitted:5/17/2012 18:39:13 CDT
Last modified:5/17/2012 19:20:26 CDT
Removed (*):9/16/2012 11:36:37 CDT
Database id:107058
Status Flags:none
Score (*):42.4506 (normalized score 0.1799)

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_id107058
person_id9
machineRedHat Virtual STEM Server
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"6255*2^851211+1" 2>&1
PFGW Version 3.3.4.20100405.x86_Stable [GWNUM 25.14]
Primality testing 6255*2^851211+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
6255*2^851211+1 is prime! (1079.5127s+0.0307s)
[Elapsed time: 18.10 minutes]
modified2012-07-16 11:32:59
created2012-05-17 18:39:50
id143692

fieldvalue
prime_id107058
person_id9
machineRedHat P4 P4
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 6255 2 851211 1 2>&1
[Elapsed time: 9.912 seconds]
modified2012-07-16 11:32:59
created2012-05-17 18:48:31
id143696

Query times: 0.0002 seconds to select prime, 0.0002 seconds to seek comments.