| 2257667 | Composite, with 4 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 187 / 640 |
Estimated T-Level: 26.5 ⓘ TF below 2^83 is very unlikely to find new factors due to ECM effort. |
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2017-10-10 | Oliver Kruse | 6C32DED31A56F0B4 | 1 | 0 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-10-18 | Oliver Kruse | D675B247207FF6B2 | 4 | 392922 | 5 | 3 | | Verified | PRP without proof (not generated) | 2017-11-21 | storm5510 | D675B247207FF6B2 | 4 | 2184395 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2017-11-21 | storm5510 | C-PRP | M2257667/216736033/2695654399/383803391/6765343160603359 : D675B247207FF6B2 | | 2017-10-18 | Oliver Kruse | C-PRP | M2257667/216736033/2695654399/383803391/6765343160603359 : D675B247207FF6B2 | | 2017-10-10 | Oliver Kruse | C-PRP | M2257667/known_factors : 6C32DED31A56F0B4 | | 2016-04-12 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 | | 2014-08-17 | TJAOI | F | Factor: 6765343160603359 | | 2008-07-14 | George Woltman | F-ECM | Factor: 383803391 | | 2008-07-14 | George Woltman | F-ECM | Factor: 2695654399 |
|
