| 4986997 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 90 / 280 |
Estimated T-Level: 21.6 ⓘ TF below 2^67 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-06-07 | Scott Gillies | 8415D19FF0023E9F | 0 | Windows,Prime95,v15,(aka WR1) | | Factored | 2001-01-08 | Jean-Yves Canart | 8415D19FF0023E9F | 871736 | Windows,Prime95,v19,(aka WV1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-01-27 | fordobr | 6C0A465639A18025 | 1 | 3547965 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-27 | Nicholas Hodson | CERT | Proof certified good | | 2025-01-27 | fordobr | C-PRP | M4986997/42206790842174076855689 : 6C0A465639A18025 Proof Certified Good
Proof Power: 7
| | 2025-01-27 | fordobr | F-ECM | Factor: 42206790842174076855689 / ECM curve 33, B1=50000, B2=88280115, Edwards Sigma=1225116903393651 | | 2022-09-15 | Prism Daymon | NF-PM1 | B1=7000000, B2=8975658510 | | 2021-04-26 | -anonymous- | NF | no factor TF: 71-72 | | 2021-04-24 | -anonymous- | NF | no factor TF: 70-71 | | 2021-04-23 | -anonymous- | NF | no factor TF: 69-70 | | 2021-01-25 | TJAOI | NF | no factor TF: 68-69 | | 2018-06-05 | ramgeis | NF | no factor TF: 67-68 | | 2017-05-21 | Yxinity | NF | no factor TF: 66-67 | | 2016-10-19 | Ismo Laitela | NF-PM1 | B1=1888594, B2=58546412, E=12 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-07-31 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-12-29 | VictordeHollander | NF | no factor TF: 64-65 | | 2014-12-29 | VictordeHollander | NF | no factor TF: 63-64 | | 2011-11-13 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-08-01 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=990000, E=6 | | 2009-11-29 | markr | NF | no factor TF: 61-62 | | 2009-08-28 | Carsten Kossendey | NF-PM1 | B1=30000, B2=435000 | | 2001-01-08 | JC | C-LL | 8415D19FF0023E9F | | 1998-06-07 | -anonymous- | C-LL | 8415D19FF0023E9F | | 1998-02-08 | Amperio | NF | no factor TF: 1-61 |
|
