| 2563943 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 263 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 66 / 640 |
Estimated T-Level: 25.5 ⓘ TF below 2^80 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 | 4011FA91D660210D | 1 | 2542560 | 5 | 3 | | Factored | PRP without proof (not generated) | 2017-12-02 | nokno | EA40153F6BE351C1 | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-12-02 | storm5510 | 4011FA91D660210D | 1 | 821581 | 5 | 3 | | Factored | PRP without proof (not generated) | 2017-12-05 | kkmrkkblmbrbk | EA40153F6BE351C1 | 1 | 1208411 | 1 | 3 | | Verified | Certified Good | 2024-03-12 | Anton Tsvetkov | 4011FA91D660210D | 2 | 717568 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2024-03-12 | Perig | CERT | Proof certified good | | 2024-03-12 | Anton Tsvetkov | C-PRP | M2563943/198515850719/9558252271932306334082399 : 4011FA91D660210D Proof Certified Good
Proof Power: 7
| | 2024-03-12 | MarkS | F-ECM | Factor: 9558252271932306334082399 / ECM curve 17, B1=50000, B2=6850000, Montgomery Sigma=8269089575088313 | | 2022-08-29 | USAFSS | NF-PM1 | B1=480000, B2=446264910 | | 2017-12-05 | kkmrkkblmbrbk | C-PRP | M2563943/198515850719 : EA40153F6BE351C1 | | 2017-12-02 | storm5510 | C-PRP | M2563943/198515850719 : 4011FA91D660210D | | 2017-12-02 | nokno | C-PRP | M2563943/198515850719 : EA40153F6BE351C1 | | 2017-10-15 | Oliver Kruse | C-PRP | M2563943/198515850719 : 4011FA91D660210D |
|
