| 5394251 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 47 / 280 |
Estimated T-Level: 20.8 ⓘ TF below 2^64 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-12-06 | Marc Honey | F046AF3773B88228 | 0 | Windows,Prime95,v16,(aka WS1) | | Factored | 2000-07-17 | Stephan Grupp | F046AF3773B88228 | 1541622 | Windows,Prime95,v20,(aka WW1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-17 | Stefan G Hoffmann | 866EF5BE630114DB | 1 | 1047808 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-17 | Stephan Grupp | CERT | Proof certified good | | 2025-03-17 | Stefan G Hoffmann | C-PRP | M5394251/49816040204853854667529 : 866EF5BE630114DB Proof Certified Good
Proof Power: 7
| | 2025-03-11 | fordobr | F-ECM | Factor: 49816040204853854667529 / ECM curve 20, B1=50000, B2=60054225, Edwards Sigma=6781441310546376 | | 2024-02-22 | Naegi Makoto | NF | no factor TF: 71-72 | | 2022-08-28 | Sid & Andy | NF-PM1 | B1=4000000, B2=10346122710 | | 2022-03-01 | mikr | NF | no factor TF: 70-71 | | 2021-10-13 | TJAOI | NF | no factor TF: 69-70 | | 2019-09-26 | lycorn | NF | no factor TF: 68-69 | | 2019-07-09 | Ivan M | NF-PM1 | B1=200000, B2=4000000 | | 2018-06-19 | ramgeis | NF | no factor TF: 67-68 | | 2016-08-13 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-08-20 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-12-25 | VictordeHollander | NF | no factor TF: 64-65 | | 2014-12-25 | VictordeHollander | NF | no factor TF: 63-64 | | 2010-10-12 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=960000, E=6 | | 2009-05-16 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-07-17 | Stephan Grupp | C-LL | F046AF3773B88228 | | 2000-06-11 | Stephan Grupp | NF-PM1 | B1=25000, B2=212500 | | 1998-12-06 | mhoney | C-LL | F046AF3773B88228 | | 1998-03-09 | -anonymous- | NF | no factor TF: 1-62 |
|
