1971 · 2488723 + 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:1971 · 2488723 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):p241 : Harvey, Srsieve, PrimeGrid, LLR, OpenPFGW
Decimal Digits:147124   (log10 is 147123.57725751)
Rank (*):36698 (digit rank is 1)
Entrance Rank (*):3596
Currently on list? (*):no
Submitted:9/2/2009 14:49:07 CDT
Last modified:9/2/2009 15:20:47 CDT
Removed (*):2/25/2010 03:02:45 CDT
Database id:89838
Status Flags:none
Score (*):40.7433 (normalized score 0.0255)

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 1971 2 488723 1 2>&1 [Elapsed time: 10.163 seconds]
modified2020-07-07 17:30:37
created2009-09-02 14:52:02

machineRedHat P4 P4
notesCommand: /home/caldwell/client/pfgw -t -q"1971*2^488723+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 1971*2^488723+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 7 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(57344,20) to FFT(57344,19) Reduced from FFT(57344,19) to FFT(57344,18) 977476 bit request FFT size=(57344,18) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 1971*2^488723+1 is prime! (1192.6600s+0.0000s) [Elapsed time: 20.70 minutes]
modified2020-07-07 17:30:37
created2009-09-02 14:53:02

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.