| 2258987 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 197 / 640 |
Estimated T-Level: 26.5 ⓘ TF below 2^83 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Stephen Nichols | 6D9CB5289307A297 | 0 | Windows,Prime95,v13,(aka WP1) | | Factored | 1998-03-17 | Dongsheng Liu | 6D9CB5289307A297 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-03-01 | Michael Collier | 6D9CB5289307A297 | 461580 | Windows,Prime95,v17,(aka WT1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2017-10-10 | Oliver Kruse | CFDE968F35A8E306 | 1 | 0 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-11-21 | storm5510 | CFDE968F35A8E306 | 1 | 1013648 | 1 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2022-03-09 | LordJulius | NF | no factor TF: 1-60 | | 2017-11-21 | storm5510 | C-PRP | M2258987/130342995475826635721 : CFDE968F35A8E306 | | 2017-10-10 | Oliver Kruse | C-PRP | M2258987/130342995475826635721 : CFDE968F35A8E306 | | 2016-04-14 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 | | 2011-01-05 | markr | F-PM1 | Factor: 130342995475826635721 | | 2010-11-12 | Joss | NF-PM1 | B1=30000 | | 2010-11-06 | Joss | NF-PM1 | B1=15000 | | 2009-01-12 | Sturle Sunde | NF | no factor TF: 60-61 | | 1999-08-16 | -anonymous- | C-LL | 6D9CB5289307A297 | | 1999-03-01 | -anonymous- | C-LL | 6D9CB5289307A297 | | 1998-03-17 | -anonymous- | NF | no factor TF: 1-58 | | 1998-03-17 | -anonymous- | C-LL | 6D9CB5289307A297 |
|
