64 · 3712171 + 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:64 · 3712171 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):x28 : Iskra
Decimal Digits:339794   (log10 is 339793.727274931)
Rank (*):10685 (digit rank is 1)
Entrance Rank (*):103
Currently on list? (*):no
Submitted:3/28/2006 15:51:36 CDT
Last modified:3/31/2006 02:25:11 CDT
Removed (*):4/20/2014 14:48:37 CDT
Database id:77396
Status Flags:none
Score (*):43.3182 (normalized score 0.6555)

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_id77396
person_id9
machineLinux P4 2.8GHz
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"64*3^712171+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 64*3^712171+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Using non-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)
2257550 bit request FFT size=(131072,18)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
64*3^712171+1 is prime! (207081.8458s+7.9726s)
[Elapsed time: 207092 seconds]
modified2006-07-19 15:46:03
created2006-03-28 16:53:36
id83786

fieldvalue
prime_id77396
person_id9
machineLinux P4 2.8GHz
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 64 3 712171 1 2>&1
[Elapsed time: 101.326 seconds]
modified2006-03-28 16:53:47
created2006-03-28 16:52:05
id83785

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.