195 · 24685711 - 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: | 195 · 24685711 - 1 |
|---|---|
| Verification status (*): | Proven |
| Official Comment (*): | [none] |
| Proof-code(s): (*): | L5175 : Liiv, PSieve, Srsieve, Rieselprime, LLR |
| Decimal Digits: | 1410542 (log10 is 1410541.8520473) |
| Rank (*): | 649 (digit rank is 1) |
| Entrance Rank (*): | 259 |
| Currently on list? (*): | yes |
| Submitted: | 3/5/2021 21:43:12 UTC |
| Last modified: | 5/20/2023 20:59:19 UTC |
| Database id: | 132121 |
| Status Flags: | none |
| Score (*): | 47.6881 (normalized score 12.908) |
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 132121 person_id 9 machine Using: Xeon (pool) 4c+4c 3.5GHz what prime notes Command: /home/caldwell/clientpool/4/pfgw64 -tp -q"195*2^4685711-1" 2>&1 PFGW Version 4.0.1.64BIT.20191203.x86_Dev [GWNUM 29.8] Primality testing 195*2^4685711-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 7, base 1+sqrt(7) Detected in MAXERR>0.45 (round off check) in Exponentiator::Iterate Iteration: 20/4685720 ERROR: ROUND OFF 0.5>0.45 (Test aborted, try again using the -a1 switch) Running N+1 test using discriminant 7, base 1+sqrt(7) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 195*2^4685711-1 is prime! (28501.7721s+0.0025s) [Elapsed time: 7.92 hours] modified 2021-04-20 22:39:24 created 2021-03-05 21:46:01 id 177820
Query times: 0.0002 seconds to select prime, 0.0003 seconds to seek comments.
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