| 5420923 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 85 / 280 |
Estimated T-Level: 21.5 ⓘ TF below 2^66 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-12-01 | Robert Cadwell | B80BE4A58525AE0C | 4838656 | Windows,Prime95,v19,(aka WV1) | | Factored | 2001-01-28 | Robert Gidley | B80BE4A58525AE0C | 413004 | 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 | Perig | B8791D3B153CE71C | 1 | 1399391 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-17 | George Woltman | CERT | Proof certified good | | 2025-03-17 | Perig | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-03-12 | Andrey Dobrynin | F-ECM | Factor: 4168745790727232358483913 / ECM curve 39, B1=50000, B2=64857975, Edwards Sigma=8804320825132113 | | 2022-07-03 | Sid & Andy | NF-PM1 | B1=5000000, B2=7248780000 | | 2021-09-17 | SRBase | NF | no factor TF: 71-72 | | 2021-08-31 | SRBase | NF | no factor TF: 70-71 | | 2021-08-19 | SRBase | NF | no factor TF: 69-70 | | 2020-09-14 | TJAOI | NF | no factor TF: 68-69 | | 2019-12-17 | King | NF-PM1 | B1=1000000, B2=22500000 | | 2018-06-29 | ramgeis | NF | no factor TF: 67-68 | | 2016-06-18 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-08-22 | snme2pm1 | NF | no factor TF: 65-66 | | 2015-01-01 | monst | NF | no factor TF: 64-65 | | 2014-12-31 | Nesowa | NF | no factor TF: 63-64 | | 2010-10-22 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=960000, E=6 | | 2009-05-14 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2001-01-28 | -anonymous- | C-LL | B80BE4A58525AE0C | | 2001-01-08 | -anonymous- | NF-PM1 | B1=25000, B2=293750 | | 1999-12-01 | -anonymous- | C-LL | B80BE4A58525AE0C | | 1999-01-29 | -anonymous- | C-LL | F7D1A30FA2A00C__ | | 1998-11-21 | -anonymous- | NF | no factor TF: 1-62 | | 1998-09-27 | -anonymous- | NF | no factor TF: 1-62 |
|
