| 4041977 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 57 / 640 |
Estimated T-Level: 25.4 ⓘ TF below 2^80 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Andrew Harms | 1EB414CA3E227292 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-09-14 | Bjørn Roger Larsen | 1EB414CA3E227292 | 2190063 | Windows,Prime95,v18,NT service,(aka WU5) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-26 | fordobr | 20D5052EC40E2A7A | 1 | 3481060 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-26 | curtisc | CERT | Proof certified good | | 2025-03-26 | fordobr | C-PRP | M4041977/17153653185202540281050623 : 20D5052EC40E2A7A Proof Certified Good
Proof Power: 7
| | 2025-03-26 | fordobr | F-ECM | Factor: 17153653185202540281050623 / ECM curve 43, B1=101210, B2=211882125, Edwards Sigma=5186212507610186 | | 2025-03-23 | Andrew B | NF | no factor TF: 71-72 | | 2022-08-06 | DRobinsonPE | NF-PM1 | B1=8700000, B2=44741156460 | | 2022-04-02 | mikr | NF | no factor TF: 70-71 | | 2021-08-03 | ATH | NF-PP1 | Start=6/5, B1=2500000, B2=167500000 | | 2021-06-17 | ATH | NF-PP1 | Start=2/7, B1=2500000, B2=177500000 | | 2020-06-03 | mikr | NF | no factor TF: 68-69 | | 2020-06-03 | mikr | NF | no factor TF: 69-70 | | 2018-10-23 | Yxinity | NF | no factor TF: 67-68 | | 2016-11-20 | Ismo Laitela | NF-PM1 | B1=2189464, B2=63494458, E=12 | | 2016-09-12 | kkmrkkblmbrbk | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-05-20 | snme2pm1 | NF | no factor TF: 65-66 | | 2013-10-23 | David Campeau | NF | no factor TF: 64-65 | | 2013-08-11 | Jayder | NF | no factor TF: 63-64 | | 2013-05-31 | Squeeky_Squirrel | NF-PM1 | B1=120000, B2=2310000, E=6 | | 2011-06-28 | USAFSS | NF-PM1 | B1=40000, B2=580000 | | 2011-05-28 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2010-10-03 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-07-15 | Carsten Kossendey | NF-PM1 | B1=20000, B2=295000 | | 2001-10-13 | David Campeau | NF | no factor TF: 1-61 | | 2001-10-06 | -anonymous- | C-LL | 1EB414CA3E227292 | | 1999-09-14 | -anonymous- | C-LL | 1EB414CA3E227292 |
|
