| 2921869 | 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 | 79 / 640 |
Estimated T-Level: 25.6 ⓘ TF below 2^80 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Joel Armengaud | 96558FBE04DD2F54 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | | Sturle Sunde | 96558FBE04DD2F54 | 0 | Mac,John Sweeney,v1.4,(aka J3) | | Factored | 2015-11-14 | MadPoo 🙂 | 96558FBE04DD2F54 | 584826 | Windows 64-bit,Prime95,v26,(aka We4) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-01-02 | Andrey Dobrynin | 26E1974C659CD944 | 1 | 248005 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-02 | Maura | CERT | Proof certified good | | 2025-01-02 | Andrey Dobrynin | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-01-02 | Andrey Dobrynin | F-ECM | Factor: 2548439144174799298717039 / ECM curve 30, B1=161849, B2=459443985, Edwards Sigma=28569167468632 | | 2023-05-26 | TJAOI | NF | no factor TF: 69-70 | | 2022-08-07 | mikr | NF-PM1 | B1=10000000, B2=19223759100 | | 2021-05-31 | TJAOI | NF | no factor TF: 68-69 | | 2018-12-18 | chuenkit | NF | no factor TF: 67-68 | | 2017-11-22 | Gordon Spence | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 1-60 | | 2016-02-22 | ramgeis | NF | no factor TF: 65-66 | | 2015-11-14 | MadPoo 🙂 | C-LL | 96558FBE04DD2F54 | | 2015-04-27 | VictordeHollander | NF-PM1 | B1=1000000, B2=20000000, E=12 | | 2015-04-25 | VictordeHollander | NF | no factor TF: 64-65 | | 2015-04-25 | VictordeHollander | NF | no factor TF: 63-64 | | 2013-01-10 | dbaugh | NF | no factor TF: 62-63 | | 2011-12-27 | Grant McCracken | NF | no factor TF: 61-62 | | 2010-11-14 | markr | NF-PM1 | B1=105000, B2=2283750, E=6 | | 2010-11-13 | Joss | NF-PM1 | B1=15000 | | 2009-02-13 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-12-23 | Team Prime Rib | NF-PM1 | B1=10000 | | 2003-12-13 | -anonymous- | NF-PM1 | B1=2048, B2=204800 |
|
