7947 · 2814542 + 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:7947 · 2814542 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1160 : Sunderland, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:245206   (log10 is 245205.47493134)
Rank (*):25368 (digit rank is 1)
Entrance Rank (*):2885
Currently on list? (*):no
Submitted:3/31/2012 09:49:32 UTC
Last modified:3/11/2023 15:54:10 UTC
Removed (*):7/11/2012 19:49:35 UTC
Database id:105960
Status Flags:none
Score (*):42.3151 (normalized score 0.0825)

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.
machineRedHat P4 P4
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 7947 2 814542 1 2>&1 [Elapsed time: 10.275 seconds]
modified2020-07-07 22:30:27
created2012-03-31 09:52:31

machineRedHat Virtual STEM Server
notesCommand: /home/caldwell/client/pfgw -t -q"7947*2^814542+1" 2>&1 PFGW Version [GWNUM 25.14] Primality testing 7947*2^814542+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 7 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 7947*2^814542+1 is prime! (859.9752s+0.0189s) [Elapsed time: 14.50 minutes]
modified2020-07-07 22:30:27
created2012-03-31 11:02:22

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