| 2581367 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 263 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 213 / 280 |
Estimated T-Level: 23.8 ⓘ TF below 2^74 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) | 2017-10-15 | Oliver Kruse | 495B87F2D52A923E | 1 | 2458084 | 5 | 3 | | Factored | PRP without proof (not generated) | 2017-12-02 | storm5510 | 495B87F2D52A923E | 1 | 2424488 | 5 | 3 | | Verified | Certified Good | 2025-05-29 | Odicin | 495B87F2D52A923E | 2 | 2490760 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-05-29 | Grant McCracken | CERT | Proof certified good | | 2025-05-29 | Odicin | C-PRP | M2581367/4956224641/855632254993278623209879 : 495B87F2D52A923E Proof Certified Good
Proof Power: 7
| | 2025-05-29 | Odicin | F-ECM | Factor: 855632254993278623209879 / ECM curve 8, B1=60316, B2=60054225, Edwards Sigma=8290582595355489 | | 2019-07-04 | alpertron | NF-PM1 | B1=2000000, B2=60000000, E=12 | | 2017-12-02 | storm5510 | C-PRP | M2581367/4956224641 : 495B87F2D52A923E | | 2017-10-15 | Oliver Kruse | C-PRP | M2581367/4956224641 : 495B87F2D52A923E |
|
