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: 67400286705 · 21290000 - 1 Verification status (*): Proven Official Comment: Proof-code(s): (*): L927 : Brown1, TwinGen, PrimeGrid, LLR Decimal Digits: 388340   (log10 is 388339.52306828) Rank (*): 9643 (digit rank is 97) Entrance Rank (*): 749 Currently on list? (*): no Submitted: 9/3/2012 22:51:17 CDT Last modified: 9/3/2012 23:50:23 CDT Removed (*): 9/29/2015 17:10:57 CDT Database id: 109130 Status Flags: none Score (*): 43.7286 (normalized score 0.7919)

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 109130 person_id 9 machine RedHat P4 P4 what trial_divided notes Command: /home/caldwell/client/TrialDiv/TrialDiv -q 67400286705 2 1290000 -1 2>&1 [Elapsed time: 10.215 seconds] modified 2012-09-15 19:04:20 created 2012-09-03 22:52:02 id 147843

field value prime_id 109130 person_id 9 machine RedHat Virtual STEM Server what prime notes Command: /home/caldwell/client/llr.pl 67400286705*2^1290000-1 2>&1 Starting Lucas Lehmer Riesel prime test of 67400286705*2^1290000-1 Using Zero Padded IBDWT : Mersenne fftlen = 65536, Used fftlen = 131072 V1 = 5 ; Computing U0... V1 = 5 ; Computing U0...done.Starting Lucas-Lehmer loop... 67400286705*2^1290000-1 is prime! Time : 3336.812 sec. [Elapsed time: 55.62 minutes] modified 2012-09-15 19:04:20 created 2012-09-03 22:52:41 id 147844