17 · 21388355 + 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:17 · 21388355 + 1
Verification status (*):Proven
Official Comment:Divides GF(1388354,10)
Proof-code(s): (*):g267 : Grobstich, NewPGen, PRP, Proth.exe
Decimal Digits:417938   (log10 is 417937.730078988)
Rank (*):4351 (digit rank is 1)
Entrance Rank (*):36
Currently on list? (*):short
Submitted:9/28/2005 09:39:29 CDT
Last modified:11/1/2005 13:37:59 CDT
Database id:75736
Status Flags:none
Score (*):43.9543 (normalized score 1.0985)

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.
Generalized Fermat Divisors (bases 3,5,6,10,12) (archivable *)
Prime on list: yes, rank 11, weight 46.7875831255837
Subcategory: "Divides GF(*,10)"
(archival tag id 187059, tag last modified 2017-08-24 21:20:02)

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.
machineLinux P4 2.8GHz
notesCommand: /home/caldwell/client/pfgw -f -t -q"17*2^1388355+1" 2>&1
PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4]
Primality testing 17*2^1388355+1 [N-1, Brillhart-Lehmer-Selfridge]
trial factoring to 156366451
Running N-1 test using base 3
Using SSE2 FFT
Adjusting authentication level by 1 for PRIMALITY PROOF
Reduced from FFT(196608,19) to FFT(196608,18)
Reduced from FFT(196608,18) to FFT(196608,17)
Reduced from FFT(196608,17) to FFT(196608,16)
2776728 bit request FFT size=(196608,16)
Calling Brillhart-Lehmer-Selfridge with factored part 100.00%
17*2^1388355+1 is prime! (47591.4691s+0.0606s)
[Elapsed time: 47591 seconds]
modified2005-09-29 12:45:09
created2005-09-28 09:53:01

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.