2 · 10748043 + 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:2 · 10748043 + 1
Verification status (*):Proven
Official Comment:Divides Phi(107^48042,2)
Proof-code(s): (*):gb1 : Buechel, Keller, PRP, Proth.exe
Decimal Digits:97498   (log10 is 97497.9858613262)
Rank (*):37971 (digit rank is 1)
Entrance Rank (*):550
Currently on list? (*):no
Submitted:4/15/2004 16:30:31 CDT
Last modified:4/15/2004 16:30:31 CDT
Database id:69908
Status Flags:none
Score (*):39.4762 (normalized score 0.0174)

Archival tags:

There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper.  Such primes are tracked with archival tags.
Divides Phi (archivable *)
Prime on list: no, rank 63
Subcategory: "Divides Phi"
(archival tag id 188343, tag last modified 2014-12-06 17:50:30)

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_id69908
person_id9
machineLinux P4 2.8GHz
whatprime
notesCommand: /home/caldwell/client/pfgw -f -t -q"2*107^48043+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 2*107^48043+1 [N-1, Brillhart-Lehmer-Selfridge]
trial factoring to 33177831
Running N-1 test using base 5
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(40960,20) to FFT(40960,19)
Reduced from FFT(40960,19) to FFT(40960,18)
Reduced from FFT(40960,18) to FFT(40960,17)
Reduced from FFT(40960,17) to FFT(40960,16)
647772 bit request FFT size=(40960,16)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
2*107^48043+1 is prime! (3400.0280s+0.0474s)
modified2004-08-05 12:46:56
created2004-04-15 16:46:10
id74864

Query times: 0.0003 seconds to select prime, 0.0005 seconds to seek comments.