21 · 21830919 + 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:||21 · 21830919 + 1|
|Verification status (*):||Proven|
|Official Comment (*):||[none]|
|Unofficial Comments:||This prime has 1 user comment below.|
|Proof-code(s): (*):||g279 : Cooper, NewPGen, PRP, Proth.exe|
|Decimal Digits:||551163 (log10 is 551162.8608504)|
|Rank (*):||3652 (digit rank is 1)|
|Entrance Rank (*):||16|
|Currently on list? (*):||yes|
|Submitted:||11/4/2004 12:34:01 CDT|
|Last modified:||11/4/2004 12:34:01 CDT|
|Score (*):||44.8043 (normalized score 1.234)|
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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 72274 person_id 9 machine Linux P4 2.8GHz what prime notes Command: /home/caldwell/client/pfgw -f -t -q"21*2^1830919+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 21*2^1830919+1 [N-1, Brillhart-Lehmer-Selfridge] trial factoring to 209757305 Running N-1 test using base 11 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(229376,19) to FFT(229376,18) Reduced from FFT(229376,18) to FFT(229376,17) Reduced from FFT(229376,17) to FFT(229376,16) 3661856 bit request FFT size=(229376,16) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 21*2^1830919+1 is prime! (-1493.6584s+0.0000s) modified 2020-07-07 17:30:45 created 2004-11-04 12:38:54 id 77271