| 2271791 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 317 / 640 |
Estimated T-Level: 27.5 ⓘ TF below 2^86 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) | 2017-10-11 | Oliver Kruse | BE7637A32525CA43 | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-21 | storm5510 | BE7637A32525CA43 | 1 | 348812 | 1 | 3 | | Verified | Certified Good | 2025-08-24 | MarkS | C8DCFCC8E60ADC76 | 2 | 1385881 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-08-24 | Ahasver Wanderer | CERT | Proof certified good | | 2025-08-24 | MarkS | C-PRP | M2271791/67893564494681/451001570064559089528559 : C8DCFCC8E60ADC76 Proof Certified Good
Proof Power: 7
| | 2025-08-19 | TJAOI | F-ECM | Factor: 451001570064559089528559 / ECM curve 39, B1=250000, B2=643227585, Edwards Sigma=4600610827713042 | | 2017-11-21 | storm5510 | C-PRP | M2271791/67893564494681 : BE7637A32525CA43 | | 2017-10-11 | Oliver Kruse | C-PRP | M2271791/67893564494681 : BE7637A32525CA43 | | 2016-04-29 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 |
|
