| 2857 | Composite, with 3 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 244 |
| Assignments | |
| 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 | 16550 / 16550 | | 55 | 110000000 | 7295 / 40830 |
Estimated T-Level: 50.9 ⓘ TF below 2^164 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 | 12C43DB5D333BCB2 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-02 | kkmrkkblmbrbk | 12C43DB5D333BCB2 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-12-07 | ATH | 12C43DB5D333BCB2 | 3 | 2663 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | 53F1FFF718EB992F | 3 | 1420 | 5 | 3 | | Verified | No proof (small exponent) | 2024-02-03 | Wentao Huang | 53F1FFF718EB992F | 3 | 1588 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-13 | masser | NF-PP1 | Start=115/37, B1=4300000000, B2=4295700000000 | | 2024-02-03 | Wentao Huang | C-PRP | M2857/3679817/284912783219951/47641828523703289 : 53F1FFF718EB992F | | 2022-02-23 | mikr | NF-PM1 | B1=60000000000, B2=314806422904433460 | | 2021-07-07 | ViliamF | NF-PM1 | B1=1000000000, B2=191000000000 | | 2020-04-17 | Oliver Kruse | C-PRP | M2857/3679817/284912783219951/47641828523703289 : 53F1FFF718EB992F | | 2017-12-07 | ATH | C-PRP | M2857/3679817/284912783219951/47641828523703289 : 12C43DB5D333BCB2 | | 2017-10-02 | kkmrkkblmbrbk | C-PRP | M2857/3679817/284912783219951/47641828523703289 : 12C43DB5D333BCB2 | | 2017-09-21 | Oliver Kruse | C-PRP | M2857/known_factors : 12C43DB5D333BCB2 | | 2011-02-05 | James Hintz | F-PM1 | Factor: 47641828523703289 |
|
