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273 · 21356347 - 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:273 · 21356347 - 1
Verification status (*):Proven
Official Comment (*):[none]
Proof-code(s): (*):L1828 : Benson, PSieve, Srsieve, Rieselprime, LLR
Decimal Digits:408304   (log10 is 408303.5676915)
Rank (*):7032 (digit rank is 1)
Entrance Rank (*):975
Currently on list? (*):no
Submitted:3/21/2013 06:27:05 CDT
Last modified:3/21/2013 09:50:27 CDT
Removed (*):9/15/2018 08:58:18 CDT
Database id:111718
Status Flags:none
Score (*):43.8827 (normalized score 0.7357)

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.
machineWinXP Dual Core 2.6GHz Laptop
notesCommand: cllr64.exe -q"273*2^1356347-1" 2>&1 -d
Starting Lucas Lehmer Riesel prime test of 273*2^1356347-1
Using AVX FFT length 84K, Pass1=448, Pass2=192
V1 = 3 ; Computing U0...
V1 = 3 ; Computing U0...done.
Starting Lucas-Lehmer loop...
273*2^1356347-1 is prime! Time : 652.969 sec.
[Elapsed time: 653 seconds]
modified2013-03-21 10:10:27
created2013-03-21 09:36:13

machineDitto P4 P4
notesCommand: /home/ditto/client/TrialDiv/TrialDiv -q 273 2 1356347 -1 2>&1
[Elapsed time: 10.575 seconds]
modified2013-03-21 09:38:25
created2013-03-21 06:35:12

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.
Printed from the PrimePages <> © Chris Caldwell.