| 4162667 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 94 / 280 |
Estimated T-Level: 21.7 ⓘ TF below 2^67 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-07-21 | Jason Gayman | B8688D129A394CDB | 0 | Windows,Prime95,v16,(aka WS1) | | Factored | 2000-03-01 | Pawel Z. Kosmeda | B8688D129A394CDB | 3386523 | Windows,Prime95,v17,(aka WT1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-02-23 | Ruslan Borisov | BCB93540BC11FB92 | 1 | 867601 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-02-23 | Chris Rycroft | CERT | Proof certified good | | 2025-02-23 | Ruslan Borisov | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-02-23 | Ruslan Borisov | F-ECM | Factor: 819137306807670108062713 / ECM curve 4, B1=85130, B2=86479575, Edwards Sigma=81507013466081 | | 2024-12-14 | bayanne | NF | no factor TF: 71-72 | | 2022-12-01 | DRobinsonPE | NF-PM1 | B1=6200000, B2=37265119710 | | 2022-08-17 | Kevin_9611 | NF-PM1 | B1=500000, B2=252569460 | | 2022-05-11 | mikr | NF | no factor TF: 70-71 | | 2021-07-01 | axn | NF | no factor TF: 69-70 | | 2021-07-01 | axn | NF | no factor TF: 68-69 | | 2020-11-28 | Carlos Pinho | NF-PM1 | B1=153000, B2=4012000 | | 2018-11-29 | Yxinity | NF | no factor TF: 67-68 | | 2017-12-19 | Yxinity | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-06-04 | snme2pm1 | NF | no factor TF: 65-66 | | 2013-10-29 | David Campeau | NF | no factor TF: 64-65 | | 2013-10-06 | Jayder | NF | no factor TF: 63-64 | | 2013-08-05 | Squeeky_Squirrel | NF-PM1 | B1=125000, B2=2375000, E=6 | | 2011-08-13 | USAFSS | NF-PM1 | B1=45000, B2=630000, E=6 | | 2011-07-17 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-01-18 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-08-02 | Carsten Kossendey | NF-PM1 | B1=25000, B2=325000 | | 2000-03-01 | -anonymous- | C-LL | B8688D129A394CDB | | 1998-07-21 | -anonymous- | C-LL | B8688D129A394CDB | | 1998-07-05 | -anonymous- | NF | no factor TF: 1-61 |
|
