| 5281979 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 79 / 280 |
Estimated T-Level: 21.4 ⓘ TF below 2^66 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-08-24 | Aamir Qaiyumi | 2D964639E26C69B5 | 0 | Windows,Prime95,v16,(aka WS1) | | Factored | 2000-07-17 | Ola Svallmark | 2D964639E26C69B5 | 3727007 | Windows,Prime95,v20,(aka WW1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-02-21 | jeriffee | E7047B2077A9068B | 1 | 2652518 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-02-21 | Yu Zhu | CERT | Proof certified good | | 2025-02-21 | jeriffee | C-PRP | M5281979/4740916392859542491711 : E7047B2077A9068B Proof Certified Good
Proof Power: 7
| | 2025-02-15 | fordobr | F-ECM | Factor: 4740916392859542491711 / ECM curve 37, B1=50000, B2=60054225, Edwards Sigma=7709381881277295 | | 2021-10-09 | axn | NF-PM1 | B1=8000000, B2=400000000 | | 2021-09-16 | SRBase | NF | no factor TF: 71-72 | | 2021-09-06 | SRBase | NF | no factor TF: 70-71 | | 2021-08-23 | SRBase | NF | no factor TF: 69-70 | | 2020-10-12 | TJAOI | NF | no factor TF: 68-69 | | 2018-06-17 | ramgeis | NF | no factor TF: 67-68 | | 2018-01-30 | Squeeky_Squirrel | NF-PM1 | B1=315000, B2=9292500, E=12 | | 2016-06-07 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-02-01 | Numberwang | NF | no factor TF: 65-66 | | 2014-12-22 | VictordeHollander | NF | no factor TF: 64-65 | | 2014-12-22 | VictordeHollander | NF | no factor TF: 63-64 | | 2010-07-20 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=975000, E=6 | | 2009-08-23 | Carsten Kossendey | NF-PM1 | B1=25000, B2=337500 | | 2009-06-04 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-07-17 | -anonymous- | C-LL | 2D964639E26C69B5 | | 1998-08-24 | -anonymous- | C-LL | 2D964639E26C69B5 | | 1998-06-01 | MadPoo 🙂 | NF | no factor TF: 1-62 | | 1998-03-09 | -anonymous- | NF | no factor TF: 1-61 |
|
