| 2507581 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 263 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 119 / 280 |
Estimated T-Level: 22.1 ⓘ TF below 2^68 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) | 2017-10-14 | Oliver Kruse | D7DB98731FFB4437 | 1 | 2278871 | 5 | 3 | | Factored | PRP without proof (not generated) | 2017-11-30 | storm5510 | D7DB98731FFB4437 | 1 | 1548450 | 5 | 3 | | Verified | Certified Good | 2024-01-09 | Nesowa | D7DB98731FFB4437 | 2 | 2018077 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2024-01-10 | LOBES | CERT | Proof certified good | | 2024-01-09 | Nesowa | C-PRP | M2507581/67200241945393/738866779122075412386169 : D7DB98731FFB4437 Proof Certified Good
Proof Power: 7
| | 2024-01-09 | Nesowa | F-ECM | Factor: 738866779122075412386169 / ECM curve 12, B1=50000, B2=38914785, Montgomery Sigma=5665488042062530 | | 2022-08-20 | USAFSS | NF-PM1 | B1=240000, B2=199861200 | | 2017-11-30 | storm5510 | C-PRP | M2507581/67200241945393 : D7DB98731FFB4437 | | 2017-10-14 | Oliver Kruse | C-PRP | M2507581/67200241945393 : D7DB98731FFB4437 |
|
