21525 · 2550165 - 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:21525 · 2550165 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L251 : Burt, NewPGen, Rieselprime, LLR
Decimal Digits:165621   (log10 is 165620.50050763)
Rank (*):38716 (digit rank is 1)
Entrance Rank (*):2668
Currently on list? (*):no
Submitted:9/28/2009 22:19:55 UTC
Last modified:3/11/2023 15:54:10 UTC
Removed (*):9/23/2010 18:27:54 UTC
Database id:90150
Status Flags:none
Score (*):41.1079 (normalized score 0.021)

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_id90150
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/llr.pl 21525*2^550165-1 2>&1 Starting Lucas Lehmer Riesel prime test of 21525*2^550165-1 Using Irrational Base DWT : Mersenne fftlen = 28672, Used fftlen = 49152 V1 = 9 ; Computing U0... V1 = 9 ; Computing U0...done. Starting Lucas-Lehmer loop... 21525*2^550165-1 is prime! Time : 740.342 sec. [Elapsed time: 12.35 minutes]
modified2020-07-07 22:30:37
created2009-09-28 22:23:01
id109673

fieldvalue
prime_id90150
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 21525 2 550165 -1 2>&1 [Elapsed time: 9.550 seconds]
modified2020-07-07 22:30:37
created2009-09-28 22:35:12
id109675

Query times: 0.0002 seconds to select prime, 0.0003 seconds to seek comments.
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