871 · 21511925 - 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.

This prime's information:

Description:871 · 21511925 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2257 : Dettweiler, PSieve, Srsieve, NPLB, LLR
Decimal Digits:455138   (log10 is 455137.71621242)
Rank (*):11240 (digit rank is 1)
Entrance Rank (*):2791
Currently on list? (*):no
Submitted:6/2/2018 03:09:21 UTC
Last modified:5/20/2023 20:59:19 UTC
Removed (*):9/5/2020 14:16:21 UTC
Database id:125355
Status Flags:none
Score (*):44.2163 (normalized score 0.4761)

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_id125355
person_id9
machineUsing: Xeon 4c+4c 3.5GHz
whatprime
notesCommand: /home/caldwell/client/llr.pl 871*2^1511925-1 2>&1 Starting Lucas Lehmer Riesel prime test of 871*2^1511925-1 Using AVX FFT length 100K, Pass1=320, Pass2=320 V1 = 4 ; Computing U0... V1 = 4 ; Computing U0...done.Starting Lucas-Lehmer loop... 871*2^1511925-1 is prime! (455138 decimal digits) Time : 706.326 sec. [Elapsed time: 11.77 minutes]
modified2020-07-07 22:30:14
created2018-06-02 03:11:01
id171024

Query times: 0.0003 seconds to select prime, 0.0005 seconds to seek comments.
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