1787720881107 · 21290000 - 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:1787720881107 · 21290000 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1624 : Wong, TwinGen, PrimeGrid, LLR
Decimal Digits:388341   (log10 is 388340.94670625)
Rank (*):11561 (digit rank is 200)
Entrance Rank (*):2485
Currently on list? (*):no
Submitted:1/30/2015 08:21:48 CDT
Last modified:1/30/2015 08:50:37 CDT
Removed (*):7/25/2016 13:28:30 CDT
Database id:119168
Status Flags:TrialDiv
Score (*):43.7286 (normalized score 0.4828)

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.
machineUsing: Xeon 4c+4c 3.5GHz
notesCommand: /home/caldwell/client/llr.pl 1787720881107*2^1290000-1 2>&1 Starting Lucas Lehmer Riesel prime test of 1787720881107*2^1290000-1 Using zero-padded AVX FFT length 128K, Pass1=128, Pass2=1K V1 = 17 ; Computing U0... V1 = 17 ; Computing U0...done.Starting Lucas-Lehmer loop... 1787720881107*2^1290000-1 is prime! (388341 decimal digits) Time : 780.505 sec. [Elapsed time: 13.02 minutes]
modified2020-07-07 17:30:17
created2015-01-30 08:33:59

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.