171 · 226237 - 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:171 · 226237 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):Z : Zarantonello, Smith_Joel, Smith_Gene, Parady, Noll, Brown
Decimal Digits:7901   (log10 is 7900.35699234626)
Rank (*):78569 (digit rank is 1)
Entrance Rank (*):24
Currently on list? (*):no
Last modified:1989
Removed (*):5/22/1999 09:00:01 CDT
Database id:19578
Status Flags:none
Score (*):31.7093 (normalized score 0)

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.
machineWindows XP P4 1.8GHz
notesPrimality testing 171*2^26237-1 [N+1, Brillhart-Lehmer-Selfridge] Calling Brillhart-Lehmer-Selfridge with factored part 99.97% 171*2^26237-1 is prime! (22.569000 seconds) PFGW Version 1.1 for Windows Running N+1 test using discriminant 7, base 1+sqrt(7)
modified2003-03-25 11:25:31
created2002-12-09 14:17:38

Query times: 0.0004 seconds to select prime, 0.0005 seconds to seek comments.
Printed from the PrimePages <primes.utm.edu> © Chris Caldwell.