
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:  173028555 · 2^{26993} + 1 
Verification status (*):  Proven 
Official Comment:  Cunningham chain 2nd kind (p) 
Proofcode(s): (*):  L983 : Wu_T, LLR 
Decimal Digits:  8134 (log_{10} is 8133.9407907388) 
Rank (*):  68951 (digit rank is 1) 
Entrance Rank (*):  47098 
Currently on list? (*):  no 
Submitted:  2/19/2010 17:29:25 CDT 
Last modified:  2/19/2010 17:50:31 CDT 
Database id:  91917 
Status Flags:  none 
Score (*):  31.7997 (normalized score 0) 

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.
 Cunningham Chains (2nd kind) (archivable class *)
 Prime on list: no, rank 20, weight 21.9619019938123
Subcategory: "Cunningham chain 2nd kind (p)"
(archival tag id 212443, tag last modified 20121106 03:50:25)
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.
field  value 
prime_id  91917 
person_id  9 
machine  Ditto P4 P4 
what  trial_divided 
notes  Command: /home/ditto/client/TrialDiv/TrialDiv q 173028555 2 26993 1 2>&1 [Elapsed time: 7.878 seconds]

modified  20111227 16:48:40 
created  20100219 17:35:01 
id  113203 

field  value 
prime_id  91917 
person_id  9 
machine  Ditto P4 P4 
what  prime 
notes  Command: /home/ditto/client/pfgw t q"173028555*2^26993+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 173028555*2^26993+1 [N1, BrillhartLehmerSelfridge] Running N1 test using base 11 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(3584,21) to FFT(3584,20) Reduced from FFT(3584,20) to FFT(3584,19) Reduced from FFT(3584,19) to FFT(3584,18) Reduced from FFT(3584,18) to FFT(3584,17) Reduced from FFT(3584,17) to FFT(3584,16) 54050 bit request FFT size=(3584,16) Calling BrillhartLehmerSelfridge with factored part 99.90% 173028555*2^26993+1 is prime! (3.5900s+0.0000s) [Elapsed time: 3.00 seconds]

modified  20100313 18:56:30 
created  20100219 17:38:01 
id  113209 

Query times: 0.0006 seconds to select prime, 0.0005 seconds to seek comments.
