| 6881981 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 270 TF target 267 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 6 / 280 |
Estimated T-Level: 20.1 ⓘ TF below 2^62 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-08-07 | IES R.Dieste-I.Larrosa | 7B316F5890975C9B | 5209125 | Windows,Prime95,v18,(aka WU1) | | Factored | 2001-11-10 | Scott Woltman | 7B316F5890975C9B | 3779168 | Linux 32-bit,Prime95,v21,(aka WX2) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2021-07-17 | 123456789123456789 | 236210525F70D2FD | 1 | 1547095 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-16 | Stef42 | NF-PM1 | B1=2359000, B2=7876698060 | | 2021-07-20 | James Heinrich | CERT | Proof certified good | | 2021-07-17 | 123456789123456789 | C-PRP | M6881981/689194066359332584471 : 236210525F70D2FD Proof Certified Good
Proof Power: 8
| | 2021-07-07 | takahashi | F | Factor: 689194066359332584471 / TF: 69-70 | | 2020-05-15 | TJAOI | NF | no factor TF: 68-69 | | 2019-12-06 | takahashi | NF-PM1 | B1=600000, B2=12000000 | | 2018-02-27 | -anonymous- | NF | no factor TF: 67-68 | | 2016-05-11 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-06-26 | VictordeHollander | NF | no factor TF: 65-66 | | 2013-10-14 | David Campeau | NF | no factor TF: 64-65 | | 2011-11-12 | James Heinrich | NF | no factor TF: 63-64 | | 2011-10-29 | James Heinrich | NF-PM1 | B1=120000, B2=2280000, E=6 | | 2001-11-10 | -anonymous- | C-LL | 7B316F5890975C9B | | 2001-10-13 | -anonymous- | NF | no factor TF: 1-63 | | 2001-09-10 | Ignacio_Larrosa | C-LL | 7B316F5890975C9B | | 2001-08-18 | Gordon Spence | NF-PM1 | B1=35000, B2=341250 | | 1999-08-07 | Ignacio_Larrosa | C-LL | 7B316F5890975C9B | | 1998-07-21 | -anonymous- | NF | no factor TF: 1-62 |
|
