| 4258879 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 273 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 131 / 280 |
Estimated T-Level: 22.3 ⓘ TF below 2^69 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-06-29 | Blaine Deal | FC875D671DFC4DEF | 0 | Windows,Prime95,v16,NT service,(aka WS5) | | Factored | 2000-08-10 | Joe Decker | FC875D671DFC4DEF | 167417 | Windows,Prime95,v19,(aka WV1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-02-05 | Andrey Dobrynin | FCDC5E654C84630F | 1 | 3933589 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-02-05 | Lolum Iridide | CERT | Proof certified good | | 2025-02-05 | Andrey Dobrynin | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-02-05 | Andrey Dobrynin | F-ECM | Factor: 192279564082371020235159860641 / ECM curve 23, B1=75584, B2=59242722, Edwards Sigma=2277861966678860 | | 2024-11-17 | TheJudger | NF | no factor TF: 72-73 | | 2024-11-17 | TheJudger | NF | no factor TF: 71-72 | | 2022-05-15 | DRobinsonPE | NF-PM1 | B1=6200000, B2=16297021650 | | 2021-01-24 | -anonymous- | NF | no factor TF: 70-71 | | 2021-01-23 | -anonymous- | NF | no factor TF: 69-70 | | 2021-01-23 | -anonymous- | NF | no factor TF: 68-69 | | 2018-11-13 | chuenkit | NF | no factor TF: 67-68 | | 2018-04-24 | chuenkit | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-12-27 | Squeeky_Squirrel | NF-PM1 | B1=200000, B2=5400000, E=6 | | 2015-06-11 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-11-17 | Joss | NF-PM1 | B1=80142 | | 2014-08-11 | -anonymous- | NF-PM1 | B1=65071 | | 2014-01-04 | David Campeau | NF | no factor TF: 64-65 | | 2013-12-26 | Jayder | NF | no factor TF: 63-64 | | 2012-01-31 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-08-19 | Squeeky_Squirrel | NF-PM1 | B1=50000, B2=762500, E=6 | | 2011-01-03 | markr | NF | no factor TF: 61-62 | | 2009-08-03 | Carsten Kossendey | NF-PM1 | B1=25000, B2=337500 | | 2000-08-10 | -anonymous- | C-LL | FC875D671DFC4DEF | | 1998-06-29 | -anonymous- | C-LL | FC875D671DFC4DEF | | 1998-06-07 | -anonymous- | NF | no factor TF: 1-61 | | 1998-05-23 | -anonymous- | NF | no factor TF: 1-60 |
|
