9985628193 · 2171009 + 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:||9985628193 · 2171009 + 1|
|Verification status (*):||Proven|
|Official Comment (*):||Cunningham chain 2nd kind (2p-1)|
|Proof-code(s): (*):||L109 : Nair, NewPGen, LLR|
|Decimal Digits:||51489 (log10 is 51488.837903893)|
|Rank (*):||56787 (digit rank is 1)|
|Entrance Rank (*):||49228|
|Currently on list? (*):||no|
|Submitted:||7/12/2016 03:14:48 CDT|
|Last modified:||7/12/2016 03:50:39 CDT|
|Score (*):||37.5076 (normalized score 0.0008)|
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.
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 121892 person_id 9 machine Using: Xeon 4c+4c 3.5GHz what prime notes Command: /home/caldwell/client/pfgw/pfgw64 -t -q"9985628193*2^171009+1" 2>&1 PFGW Version 220.127.116.11BIT.20130722.x86_Dev [GWNUM 27.11] Primality testing 9985628193*2^171009+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Calling Brillhart-Lehmer-Selfridge with factored part 99.98% 9985628193*2^171009+1 is prime! (18.8392s+0.0003s) [Elapsed time: 19.00 seconds] modified 2020-07-07 17:30:16 created 2016-07-12 03:21:01 id 167530