| 3947431 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 271 TF target 264 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 109 / 280 |
Estimated T-Level: 21.9 ⓘ TF below 2^68 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Bad | 1998-03-03 | Frank Grossmann | C97FDE2F1BDEC4D3 | 0 | Windows,Prime95,v15,(aka WR1) | | Factored | 1999-09-22 | Milan Sismanovic | 307A5672A832DA9C | 330604 | Windows,Prime95,v18,(aka WU1) | | Factored | 1999-11-04 | Blaine Deal | 307A5672A832DA9C | 1151691 | Windows,Prime95,v18,NT service,(aka WU5) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-02-19 | Andrey Dobrynin | 8F0C41BF9FE96C13 | 1 | 2354126 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-02-19 | pilot no more | CERT | Proof certified good | | 2025-02-19 | Andrey Dobrynin | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-02-19 | Andrey Dobrynin | F-ECM | Factor: 748714412680846633410089 / ECM curve 3, B1=97350, B2=194573610, Edwards Sigma=6245330117199681 | | 2023-07-21 | Denial140 | NF-PM1 | B1=20996011, B2=75921755910 | | 2023-02-25 | Denial140 | NF-PM1 | B1=20996011 | | 2022-12-18 | Joss | NF-PM1 | B1=1000000, B2=481787460 | | 2022-10-09 | Joss | NF-PM1 | B1=1000000, B2=113097600 | | 2022-05-15 | Joss | NF-PM1 | B1=500000, B2=113097600 | | 2021-06-03 | -anonymous- | NF | no factor TF: 70-71 | | 2021-05-02 | axn | NF | no factor TF: 69-70 | | 2020-05-22 | TJAOI | NF | no factor TF: 68-69 | | 2018-07-23 | TJAOI | NF | no factor TF: 67-68 | | 2017-07-20 | Joss | NF-PM1 | B1=380160, B2=3801600, E=6 | | 2016-12-11 | Gordon Spence | NF | no factor TF: 66-67 | | 2016-05-02 | Joss | NF-PM1 | B1=190080, B2=3421440 | | 2016-05-01 | Joss | NF-PM1 | B1=190080, B2=2878185, E=6 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2016-02-13 | ramgeis | NF | no factor TF: 65-66 | | 2015-01-14 | VictordeHollander | NF | no factor TF: 64-65 | | 2015-01-14 | VictordeHollander | NF | no factor TF: 63-64 | | 2014-11-14 | Joss | NF-PM1 | B1=86260 | | 2012-02-20 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-09-25 | Squeeky_Squirrel | NF-PM1 | B1=70000, B2=1190000, E=6 | | 2011-03-20 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-08-02 | Carsten Kossendey | NF-PM1 | B1=20000, B2=285000 | | 2008-12-28 | Architects Cubed | NF | no factor TF: 60-61 | | 1999-11-04 | -anonymous- | C-LL | 307A5672A832DA9C | | 1999-09-22 | -anonymous- | C-LL | 307A5672A832DA9C | | 1998-03-03 | -anonymous- | C-LL | C97FDE2F1BDEC4D3 | | 1997-12-04 | Amperio | NF | no factor TF: 1-60 |
|
