| 2519981 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 270 TF target 263 |
| 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 | | Joe Decker | 0C3CA6AA3A1C38BA | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-03-15 | David Phillips | 0C3CA6AA3A1C38BA | 575830 | Windows,Prime95,v17,(aka WT1) | | Factored | 2018-06-05 | kkmrkkblmbrbk | 0C3CA6AA3A1C38BA | 1406950 | Windows 64-bit,Prime95,v29.4,build 5 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-01-10 | fordobr | F74C7981784A5429 | 1 | 1739200 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-10 | Jonathan Webb | CERT | Proof certified good | | 2025-01-10 | fordobr | C-PRP | M2519981/6170866891727501617193 : F74C7981784A5429 Proof Certified Good
Proof Power: 7
| | 2025-01-09 | fordobr | F-ECM | Factor: 6170866891727501617193 / ECM curve 14, B1=171331, B2=367552185, Edwards Sigma=3518381926323317 | | 2023-01-24 | Architects Cubed | NF-PM1 | B1=5000000, B2=8936884110 | | 2022-12-12 | Architects Cubed | NF | no factor TF: 69-70 | | 2021-05-13 | TJAOI | NF | no factor TF: 68-69 | | 2019-04-29 | TJAOI | NF | no factor TF: 67-68 | | 2018-06-05 | kkmrkkblmbrbk | C-LL | 0C3CA6AA3A1C38BA | | 2018-05-06 | mikr | NF-PM1 | B1=3000000, B2=135000000, E=12 | | 2017-11-04 | Joss | NF-PM1 | B1=600000, B2=6000000, E=6 | | 2017-08-01 | Gordon Spence | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 59-60 | | 2015-11-06 | ramgeis | NF | no factor TF: 65-66 | | 2015-02-18 | VictordeHollander | NF | no factor TF: 64-65 | | 2015-02-18 | VictordeHollander | NF | no factor TF: 63-64 | | 2013-01-14 | dbaugh | NF | no factor TF: 62-63 | | 2012-06-13 | Sebastian Hornbostel | NF | no factor TF: 61-62 | | 2011-03-03 | James Heinrich | NF-PM1 | B1=300000, B2=8000000, E=12 | | 2011-01-06 | Joss | NF-PM1 | B1=50000 | | 2011-01-01 | Joss | NF-PM1 | B1=30000 | | 2010-12-19 | Joss | NF-PM1 | B1=20000 | | 2009-01-31 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-10-31 | Team Prime Rib | NF-PM1 | B1=15000, B2=236250 | | 2003-10-23 | -anonymous- | NF-PM1 | B1=2048, B2=204800 | | 1999-03-15 | -anonymous- | C-LL | 0C3CA6AA3A1C38BA | | 1999-03-15 | -anonymous- | NF | no factor TF: 1-59 |
|
