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87 · 2796341 - 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:87 · 2796341 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L145 : Minovic, Ksieve, NewPGen, Rieselprime, LLR
Decimal Digits:239725   (log10 is 239724.467296303)
Rank (*):20735 (digit rank is 1)
Entrance Rank (*):177
Currently on list? (*):no
Submitted:3/28/2006 13:40:27 CDT
Last modified:3/29/2006 10:34:41 CDT
Removed (*):6/15/2012 01:38:23 CDT
Database id:77388
Status Flags:none
Score (*):42.2456 (normalized score 0.1431)

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_id77388
person_id9
machineLinux P4 2.8GHz
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 87 2 796341 -1 2>&1
[Elapsed time: 43.414 seconds]
modified2006-03-31 16:07:06
created2006-03-28 16:53:48
id83787

fieldvalue
prime_id77388
person_id9
machineWinXP P4 2.2GHz By K
whatprime
notesCommand: pfgw.exe -n -f -tp -q"87*2^796341-1" 2>&1
PFGW Version 1.2.0 for Windows [FFT v23.8]
Primality testing 87*2^796341-1 [N+1, Brillhart-Lehmer-Selfridge]
trial factoring to 86591526
Running N+1 test using discriminant 5, base 1+sqrt(5)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
87*2^796341-1 is prime! (32037.1106s+0.0460s)
[Elapsed time: 32036 seconds]
modified2006-03-31 16:07:06
created2006-03-29 01:40:39
id83823

Query times: 0.0004 seconds to select prime, 0.0003 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.