261 · 22152805 + 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:261 · 22152805 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1125 : Laluk, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:648062   (log10 is 648061.2964559)
Rank (*):4329 (digit rank is 1)
Entrance Rank (*):252
Currently on list? (*):yes
Submitted:2/4/2014 22:34:57 UTC
Last modified:5/20/2023 20:59:19 UTC
Database id:117062
Status Flags:none
Score (*):45.3016 (normalized score 1.3974)

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_id117062
person_id9
machineWinXP Dual Core 2.6GHz 64-bit Laptop
whatprime
notesCommand: pfgw64.exe -t -q"261*2^2152805+1" 2>&1 PFGW Version 3.7.3.64BIT.20130210.Win_Dev [GWNUM 27.8] Primality testing 261*2^2152805+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 261*2^2152805+1 is prime! (3757.5055s+0.0084s) [Elapsed time: 3758 seconds]
modified2020-07-07 22:30:18
created2014-02-05 03:33:54
id162578

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