1605 · 21568792 + 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:1605 · 21568792 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2981 : Yoshigoe, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:472257   (log10 is 472256.65443272)
Rank (*):10543 (digit rank is 1)
Entrance Rank (*):3699
Currently on list? (*):no
Submitted:2/19/2020 16:07:53 UTC
Last modified:5/20/2023 20:59:19 UTC
Removed (*):2/18/2021 14:40:05 UTC
Database id:130572
Status Flags:none
Score (*):44.3297 (normalized score 0.5287)

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_id130572
person_id9
machineUsing: Xeon 4c+4c 3.5GHz
whatprime
notesCommand: /home/caldwell/client/pfgw/pfgw64 -t -q"1605*2^1568792+1" 2>&1 PFGW Version 4.0.1.64BIT.20191203.x86_Dev [GWNUM 29.8] Primality testing 1605*2^1568792+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 11 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 1605*2^1568792+1 is prime! (1057.6116s+0.0009s) [Elapsed time: 17.63 minutes]
modified2020-07-07 22:30:10
created2020-02-19 16:11:01
id176258

Query times: 0.0002 seconds to select prime, 0.0011 seconds to seek comments.
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