| 4191217 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 145 / 280 |
Estimated T-Level: 22.6 ⓘ TF below 2^70 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Ken Kriesel | 7FF19F23CF04F178 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-10-21 | David W. Walker | 7FF19F23CF04F178 | 3680355 | Windows,Prime95,v17,(aka WT1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-02 | fordobr | 7BAFFB2B6712235A | 1 | 3237816 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-02 | carel van der westhuizen | CERT | Proof certified good | | 2025-03-02 | fordobr | C-PRP | M4191217/6341403118787190799343 : 7BAFFB2B6712235A Proof Certified Good
Proof Power: 7
| | 2025-03-02 | fordobr | F-ECM | Factor: 6341403118787190799343 / ECM curve 19, B1=85158, B2=117709515, Edwards Sigma=5121603413142926 | | 2024-11-27 | bayanne | NF | no factor TF: 71-72 | | 2022-12-12 | DRobinsonPE | NF-PM1 | B1=6200000, B2=33322740360 | | 2022-06-01 | mikr | NF | no factor TF: 70-71 | | 2021-06-15 | axn | NF | no factor TF: 69-70 | | 2021-06-07 | TJAOI | NF | no factor TF: 68-69 | | 2021-04-04 | Dylan Delgado | NF-PM1 | B1=400000, B2=12000000, E=12 | | 2018-12-07 | Yxinity | NF | no factor TF: 67-68 | | 2017-12-23 | Yxinity | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-06-06 | snme2pm1 | NF | no factor TF: 65-66 | | 2013-11-16 | David Campeau | NF | no factor TF: 64-65 | | 2013-10-26 | Jayder | NF | no factor TF: 63-64 | | 2013-08-24 | Squeeky_Squirrel | NF-PM1 | B1=125000, B2=2406250, E=6 | | 2011-08-25 | USAFSS | NF-PM1 | B1=45000, B2=630000, E=6 | | 2011-07-01 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2010-12-20 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-08-04 | Carsten Kossendey | NF-PM1 | B1=25000, B2=337500 | | 2001-09-30 | David Campeau | NF | no factor TF: 1-61 | | 1999-10-21 | -anonymous- | C-LL | 7FF19F23CF04F178 |
|
