| 5219393 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 270 TF target 266 |
| Factored | |
| P-1 factors | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 9 / 280 |
Estimated T-Level: 20.2 ⓘ TF below 2^62 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-02-21 | Calkins | 2881F7891DBEB7B5 | 0 | Windows,Prime95,v16,(aka WS1) | | Factored | 2000-08-10 | Brian | 2881F7891DBEB7B5 | 256593 | Windows,Prime95,v20,(aka WW1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2018-06-08 | storm5510 | 1A64E0F5A1214238 | 1 | 2205548 | 5 | 3 | | Verified | PRP without proof (not generated) | 2018-06-09 | arnaud | 1A64E0F5A1214238 | 1 | 4553209 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-11 | Sid & Andy | NF | no factor TF: 68-70 | | 2018-06-17 | ramgeis | NF | no factor TF: 67-68 | | 2018-06-09 | arnaud | C-PRP | M5219393/2124987378990772937670719 : 1A64E0F5A1214238 | | 2018-06-08 | storm5510 | C-PRP | M5219393/2124987378990772937670719 : 1A64E0F5A1214238 | | 2018-06-07 | Squeeky_Squirrel | F-PM1 | Factor: 2124987378990772937670719 / B1=310000, B2=9222500 | | 2016-05-30 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-01-26 | 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 | | 2009-10-23 | USAFSS | NF-PM1 | B1=60000, B2=975000, E=6 | | 2009-06-18 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-08-10 | -anonymous- | C-LL | 2881F7891DBEB7B5 | | 2000-07-25 | -anonymous- | NF-PM1 | B1=20000, B2=130000 | | 1999-02-21 | Keith G. Calkins | C-LL | 2881F7891DBEB7B5 | | 1998-05-23 | -anonymous- | NF | no factor TF: 1-62 | | 1998-02-12 | -anonymous- | NF | no factor TF: 1-61 |
|
