| 4174207 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 255 / 280 |
Estimated T-Level: 24.6 ⓘ TF below 2^77 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Dax Prather | 513AFEAB542BEDF1 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-10-15 | Larry T | 513AFEAB542BEDF1 | 432706 | Windows,Prime95,v19,(aka WV1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-02-23 | fordobr | D881CE0D5CB6D51E | 1 | 1868879 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-02-23 | silerm | CERT | Proof certified good | | 2025-02-23 | fordobr | C-PRP | M4174207/21573358245607727829219617 : D881CE0D5CB6D51E Proof Certified Good
Proof Power: 7
| | 2025-02-23 | fordobr | F-ECM | Factor: 21573358245607727829219617 / ECM curve 50, B1=84551, B2=145935405, Edwards Sigma=4876761285148291 | | 2024-12-05 | Andrew B | NF | no factor TF: 71-72 | | 2022-12-07 | DRobinsonPE | NF-PM1 | B1=6200000, B2=28122644550 | | 2022-05-15 | mikr | NF | no factor TF: 70-71 | | 2021-07-07 | axn | NF | no factor TF: 69-70 | | 2021-07-01 | TJAOI | NF | no factor TF: 68-69 | | 2018-12-07 | Yxinity | NF | no factor TF: 67-68 | | 2017-12-20 | Yxinity | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-06-05 | snme2pm1 | NF | no factor TF: 65-66 | | 2013-11-02 | David Campeau | NF | no factor TF: 64-65 | | 2013-10-15 | Jayder | NF | no factor TF: 63-64 | | 2012-04-01 | Markus Tervooren | NF-PM1 | B1=2000000, B2=20000000, E=12 | | 2011-08-21 | USAFSS | NF-PM1 | B1=45000, B2=630000, E=6 | | 2011-07-17 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-01-28 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-08-03 | Carsten Kossendey | NF-PM1 | B1=25000, B2=337500 | | 2001-11-24 | David Campeau | NF | no factor TF: 1-61 | | 1999-10-15 | -anonymous- | C-LL | 513AFEAB542BEDF1 |
|
