| 8971 | Composite, with 3 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 244 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 640 / 640 | | 35 | 1000000 | 1566 / 1566 | | 40 | 3000000 | 4588 / 4588 | | 45 | 11000000 | 9201 / 9201 | | 50 | 44000000 | 8617 / 16550 |
Estimated T-Level: 47.6 ⓘ TF below 2^153 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 |
|---|
| Verified | No proof (small exponent) | 2017-09-21 | Oliver Kruse | B09688B077AF3000 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-02 | kkmrkkblmbrbk | B09688B077AF3000 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-12-07 | ATH | B09688B077AF3000 | 3 | 7113 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | CAE464A3BF28B6C4 | 3 | 928 | 5 | 3 | | Verified | No proof (small exponent) | 2024-07-01 | kkmrkkblmbrbk | CAE464A3BF28B6C4 | 3 | 2059 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-23 | masser | NF-PP1 | Start=146/31, B1=1000000000, B2=999000000000 | | 2024-07-01 | kkmrkkblmbrbk | C-PRP | M8971/3220810996367/59568301217/6589256682907003009092967 : CAE464A3BF28B6C4 | | 2023-07-25 | JacobZ | NF-PM1 | B1=65000000000, B2=251099672798124150 | | 2021-12-16 | ANONYMOUS | NF-PM1 | B1=100000000 | | 2020-04-17 | Oliver Kruse | C-PRP | M8971/59568301217/3220810996367/6589256682907003009092967 : CAE464A3BF28B6C4 | | 2017-12-07 | ATH | C-PRP | M8971/59568301217/3220810996367/6589256682907003009092967 : B09688B077AF3000 | | 2017-10-02 | kkmrkkblmbrbk | C-PRP | M8971/59568301217/3220810996367/6589256682907003009092967 : B09688B077AF3000 | | 2017-09-21 | Oliver Kruse | C-PRP | M8971/known_factors : B09688B077AF3000 | | 1998-01-05 | -anonymous- | NF | no factor TF: 1-50 |
|
