621 · 21218520 + 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:621 · 21218520 + 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L2085 : Dodson1, PSieve, Srsieve, PrimeGrid, LLR
Decimal Digits:366814   (log10 is 366813.86340807)
Rank (*):12352 (digit rank is 1)
Entrance Rank (*):474
Currently on list? (*):no
Submitted:11/13/2011 22:06:40 CDT
Last modified:11/13/2011 23:50:37 CDT
Removed (*):1/27/2015 19:16:28 CDT
Database id:103003
Status Flags:none
Score (*):43.5534 (normalized score 0.5243)

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_id103003
person_id9
machineRedHat P4 P4
whattrial_divided
notesCommand: /home/caldwell/client/TrialDiv/TrialDiv -q 621 2 1218520 1 2>&1 [Elapsed time: 10.151 seconds]
modified2020-07-07 17:30:30
created2011-11-13 22:18:01
id135578

fieldvalue
prime_id103003
person_id9
machineRedHat P4 P4
whatprime
notesCommand: /home/caldwell/client/pfgw -t -q"621*2^1218520+1" 2>&1 PFGW Version 3.4.5.32BIT.20110215.x86_Dev [GWNUM 26.5] Primality testing 621*2^1218520+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 5 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 621*2^1218520+1 is prime! (3898.5347s+0.0012s) [Elapsed time: 64.98 minutes]
modified2020-07-07 17:30:30
created2011-11-13 22:37:30
id135580

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