1815615642825 · 244046 - 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:1815615642825 · 244046 - 1
Verification status (*):Proven
Official Comment (*):Cunningham chain (4p+3)
Proof-code(s): (*):p395 : Angel, Augustin, NewPGen, OpenPFGW
Decimal Digits:13272   (log10 is 13271.426212932)
Rank (*):78956 (digit rank is 1)
Entrance Rank (*):68090
Currently on list? (*):short
Submitted:11/20/2016 02:29:27 UTC
Last modified:5/20/2023 20:59:19 UTC
Database id:122516
Status Flags:none
Score (*):33.317 (normalized score 0)

Archival tags:

There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper.  Such primes are tracked with archival tags.
Cunningham Chains (1st kind) (archivable class *)
Prime on list: yes, rank 2, weight 42.594195771876
Subcategory: "Cunningham chain (4p+3)"
(archival tag id 218519, tag last modified 2023-03-11 15:53:59)

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 1815615642825*2^44046-1 2>&1 Starting Lucas Lehmer Riesel prime test of 1815615642825*2^44046-1 Using zero-padded AVX FFT length 5K V1 = 5 ; Computing U0... V1 = 5 ; Computing U0...done.Starting Lucas-Lehmer loop... 1815615642825*2^44046-1 is prime! (13272 decimal digits) Time : 1.628 sec. [Elapsed time: 2.00 seconds]
modified2020-07-07 22:30:16
created2016-11-20 02:31:01

Query times: 0.0003 seconds to select prime, 0.0004 seconds to seek comments.
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