7979 · 21238639 + 1
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At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important databases at The Prime Pages: 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:

field (help)value
Description:7979 · 21238639 + 1
Verification status (*):Proven
Official Comment:
Proof-code(s): (*):L3423 : Collins, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:372872   (log10 is 372871.3947477)
Rank (*):9110 (digit rank is 1)
Entrance Rank (*):2827
Currently on list? (*):no
Submitted:1/24/2014 10:29:48 CDT
Last modified:1/24/2014 12:20:54 CDT
Removed (*):2/28/2015 06:13:54 CDT
Database id:116988
Status Flags:TrialDiv
Score (*):43.6037 (normalized score 0.8558)

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_id116988
person_id9
machineDitto P4 P4
whatprime
notesCommand: /home/ditto/client/pfgw -t -q"7979*2^1238639+1" 2>&1
PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5]
Primality testing 7979*2^1238639+1 [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
7979*2^1238639+1 is prime! (4131.4160s+0.0012s)
[Elapsed time: 68.87 minutes]
modified2014-04-01 17:37:38
created2014-01-24 10:43:52
id162502

Query times: 0.0005 seconds to select prime, 0.0006 seconds to seek comments.