8921 · 2479193 + 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.
This prime's information:
| Description: | 8921 · 2479193 + 1 |
|---|---|
| Verification status (*): | Proven |
| Official Comment (*): | [none] |
| Proof-code(s): (*): | L834 : Kaiser1, Srsieve, PrimeGrid, LLR |
| Decimal Digits: | 144256 (log10 is 144255.41712575) |
| Rank (*): | 42983 (digit rank is 1) |
| Entrance Rank (*): | 4152 |
| Currently on list? (*): | no |
| Submitted: | 10/12/2009 19:57:59 UTC |
| Last modified: | 3/11/2023 15:54:10 UTC |
| Removed (*): | 1/18/2010 18:36:50 UTC |
| Database id: | 90432 |
| Status Flags: | none |
| Score (*): | 40.6827 (normalized score 0.0113) |
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 90432 person_id 9 machine Ditto P4 P4 what trial_divided notes Command: /home/ditto/client/TrialDiv/TrialDiv -q 8921 2 479193 1 2>&1 [Elapsed time: 9.861 seconds] modified 2020-07-07 22:30:37 created 2009-10-12 20:05:20 id 110235
field value prime_id 90432 person_id 9 machine RedHat P4 P4 what prime notes Command: /home/caldwell/client/pfgw -t -q"8921*2^479193+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 8921*2^479193+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(57344,20) to FFT(57344,19) Reduced from FFT(57344,19) to FFT(57344,18) Reduced from FFT(57344,18) to FFT(57344,17) 958422 bit request FFT size=(57344,17) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 8921*2^479193+1 is prime! (1147.5200s+0.0000s) [Elapsed time: 19.25 minutes] modified 2020-07-07 22:30:37 created 2009-10-12 20:23:01 id 110237
Query times: 0.0003 seconds to select prime, 0.0003 seconds to seek comments.
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