195 · 21667115 - 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:195 · 21667115 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1828 : Benson, PSieve, Srsieve, Rieselprime, LLR
Decimal Digits:501854   (log10 is 501853.91125597)
Rank (*):4235 (digit rank is 1)
Entrance Rank (*):759
Currently on list? (*):yes
Submitted:1/25/2014 11:12:20 CDT
Last modified:1/25/2014 13:21:24 CDT
Database id:116992
Status Flags:TrialDiv
Score (*):44.5164 (normalized score 1.1378)

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_id116992
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/llr.pl 195*2^1667115-1 2>&1 Starting Lucas Lehmer Riesel prime test of 195*2^1667115-1 Using Irrational Base DWT : Mersenne fftlen = 98304, Used fftlen = 114688 V1 = 15 ; Computing U0... V1 = 15 ; Computing U0...done. Starting Lucas-Lehmer loop... 195*2^1667115-1 is prime! Time : 6354.342 sec. [Elapsed time: 1.77 hours]
modified2020-07-07 17:30:18
created2014-01-25 11:23:01
id162506

Query times: 0.0006 seconds to select prime, 0.001 seconds to seek comments.
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