| 4389883 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 273 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 151 / 280 |
Estimated T-Level: 22.7 ⓘ TF below 2^70 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Steve Sommars | 6DA9EDA86C0735E3 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-12-15 | Stephan Grupp | 6DA9EDA86C0735E3 | 1347732 | Windows,Prime95,v19,(aka WV1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-01 | fordobr | 735F0100D2F4D821 | 1 | 810429 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-01 | Fabrice Bellet | CERT | Proof certified good | | 2025-03-01 | fordobr | C-PRP | M4389883/399756309197009705861911113457 : 735F0100D2F4D821 Proof Certified Good
Proof Power: 7
| | 2025-03-01 | fordobr | F-ECM | Factor: 399756309197009705861911113457 / ECM curve 28, B1=73178, B2=117709515, Edwards Sigma=2670119005274176 | | 2022-12-26 | DRobinsonPE | NF-PM1 | B1=6200000, B2=28879919250 | | 2021-02-11 | -anonymous- | NF | no factor TF: 72-73 | | 2021-01-30 | -anonymous- | NF | no factor TF: 71-72 | | 2021-01-30 | -anonymous- | NF | no factor TF: 70-71 | | 2021-01-25 | -anonymous- | NF | no factor TF: 69-70 | | 2021-01-25 | -anonymous- | NF | no factor TF: 68-69 | | 2018-10-30 | chuenkit | NF | no factor TF: 67-68 | | 2018-10-23 | Ismo Laitela | NF-PM1 | B1=2189464, B2=63494458, E=12 | | 2018-05-04 | chuenkit | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-06-20 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-07-27 | lycorn | NF | no factor TF: 64-65 | | 2014-07-27 | Jayder | NF | no factor TF: 63-64 | | 2012-02-29 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2012-01-11 | Squeeky_Squirrel | NF-PM1 | B1=110000, B2=2255000, E=6 | | 2010-11-07 | markr | NF | no factor TF: 61-62 | | 2009-07-28 | Carsten Kossendey | NF-PM1 | B1=25000, B2=356250 | | 2001-12-08 | David Campeau | NF | no factor TF: 1-61 | | 1999-12-15 | Stephan Grupp | C-LL | 6DA9EDA86C0735E3 |
|
