2128305031965 · 21290000 - 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:2128305031965 · 21290000 - 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L927 : Brown1, TwinGen, PrimeGrid, LLR
Decimal Digits:388342   (log10 is 388341.022440407)
Rank (*):6528 (digit rank is 1375)
Entrance Rank (*):3111
Currently on list? (*):no
Submitted:8/9/2015 08:45:42 CDT
Last modified:8/9/2015 09:20:28 CDT
Removed (*):9/29/2016 14:12:23 CDT
Database id:120211
Status Flags:TrialDiv
Score (*):43.7286 (normalized score 0.9763)

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_id120211
person_id9
machineUsing: Xeon 4c+4c 3.5GHz
whatprime
notesCommand: /home/caldwell/client/llr.pl 2128305031965*2^1290000-1 2>&1
Starting Lucas Lehmer Riesel prime test of 2128305031965*2^1290000-1
Using zero-padded AVX FFT length 128K, Pass1=128, Pass2=1K
V1 = 9 ; Computing U0...
V1 = 9 ; Computing U0...done.Starting Lucas-Lehmer loop...


2128305031965*2^1290000-1 is prime! (388342 decimal digits) Time : 778.773 sec.
[Elapsed time: 12.98 minutes]
modified2016-04-08 12:40:28
created2015-08-09 08:51:01
id165839

Query times: 0.0001 seconds to select prime, 0.0002 seconds to seek comments.