| 2539 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 244 |
| Assignments | | Assigned | User | Work Type | Stage | % Done | Updated | Est Complete | Expired |
|---|
| 2026-01-24 | masser | ECM | | | 2026-01-29 | 2026-01-29 | |
|
| Factored | | Factor | Digits | Bits | Date |
|---|
| 25391 | 5 | 14.6 | old |
|
| 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 | 9479 / 40830 |
Estimated T-Level: 51.2 ⓘ TF below 2^165 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 | E3382C99A9C7E940 | 1 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-12 | kkmrkkblmbrbk | E3382C99A9C7E940 | 1 | 2424 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | 3D4162229A21B064 | 1 | 1008 | 5 | 3 | | Verified | No proof (small exponent) | 2024-02-03 | Wentao Huang | 3D4162229A21B064 | 1 | 1241 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-09 | masser | NF-PP1 | Start=168/67, B1=4300000000, B2=4295700000000 | | 2024-02-03 | Wentao Huang | C-PRP | M2539/25391 : 3D4162229A21B064 | | 2022-02-12 | mikr | NF-PM1 | B1=60000000000, B2=314766415184771550 | | 2020-04-17 | Oliver Kruse | C-PRP | M2539/25391 : 3D4162229A21B064 | | 2017-10-12 | kkmrkkblmbrbk | C-PRP | M2539/25391 : E3382C99A9C7E940 | | 2017-09-21 | Oliver Kruse | C-PRP | M2539/25391 : E3382C99A9C7E940 | | 2017-09-21 | Oliver Kruse | C-PRP | M2539/25391 : E3382C99A9C7E940 |
|
