1279182707955 · 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:1279182707955 · 21290000 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1920 : Iwasaki, TwinGen, PrimeGrid, LLR
Decimal Digits:388341   (log10 is 388340.80133912)
Rank (*):10569 (digit rank is 644)
Entrance Rank (*):1699
Currently on list? (*):no
Submitted:2/25/2014 10:37:55 CDT
Last modified:2/25/2014 12:52:13 CDT
Removed (*):3/20/2016 20:24:00 CDT
Database id:117279
Status Flags:TrialDiv
Score (*):43.7286 (normalized score 0.5926)

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_id117279
person_id9
machineDitto P4 P4
whatprime
notesCommand: /home/ditto/client/llr.pl 1279182707955*2^1290000-1 2>&1 Starting Lucas Lehmer Riesel prime test of 1279182707955*2^1290000-1 Using Zero Padded IBDWT : Mersenne fftlen = 65536, Used fftlen = 131072 V1 = 5 ; Computing U0... V1 = 5 ; Computing U0...done. Starting Lucas-Lehmer loop... 1279182707955*2^1290000-1 is prime! Time : 7148.451 sec. [Elapsed time: 1.99 hours]
modified2020-07-07 17:30:17
created2014-02-25 10:38:01
id162796

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