1947 · 2801115 + 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.

Description:1947 · 2801115 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2787 : Kapicioglu, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:241163   (log10 is 241162.9343423)
Rank (*):20833 (digit rank is 1)
Entrance Rank (*):2985
Currently on list? (*):no
Submitted:3/19/2012 04:26:17 CDT
Last modified:3/19/2012 06:20:23 CDT
Removed (*):6/22/2012 16:09:40 CDT
Database id:105700
Status Flags:none
Score (*):42.264 (normalized score 0.1405)

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_id105700
person_id9
machineDitto P4 P4
whattrial_divided
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 1947 2 801115 1 2>&1 [Elapsed time: 10.210 seconds]
modified2020-07-07 17:30:27
created2012-03-19 04:35:31
id140987

fieldvalue
prime_id105700
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"1947*2^801115+1" 2>&1 PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5] Primality testing 1947*2^801115+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 1947*2^801115+1 is prime! (1556.7690s+0.0009s) [Elapsed time: 25.95 minutes]
modified2020-07-07 17:30:27
created2012-03-19 05:40:27
id140996

Query times: 0.0005 seconds to select prime, 0.0007 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.