| 7873 | 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 | 12348 / 16550 |
Estimated T-Level: 48.7 ⓘ TF below 2^157 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 | 2C2CBFC151043709 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-02 | kkmrkkblmbrbk | 2C2CBFC151043709 | 3 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-12-07 | ATH | 2C2CBFC151043709 | 3 | 7334 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | 12C94DF4F0C39F0B | 3 | 2986 | 5 | 3 | | Verified | No proof (small exponent) | 2024-02-03 | Wentao Huang | 12C94DF4F0C39F0B | 3 | 1219 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-05-29 | masser | NF-PP1 | Start=93/53, B1=1300000000, B2=1298700000000 | | 2024-12-11 | yuriy_5-1 | NF-PM1 | B1=24000000000, B2=93848103835646160 | | 2024-02-03 | Wentao Huang | C-PRP | M7873/1180951/1200160121/99962587251231955979753667848833 : 12C94DF4F0C39F0B | | 2021-07-10 | ViliamF | NF-PM1 | B1=1000000000, B2=201000000000 | | 2020-04-17 | Oliver Kruse | C-PRP | M7873/1180951/1200160121/99962587251231955979753667848833 : 12C94DF4F0C39F0B | | 2017-12-07 | ATH | C-PRP | M7873/1180951/1200160121/99962587251231955979753667848833 : 2C2CBFC151043709 | | 2017-10-02 | kkmrkkblmbrbk | C-PRP | M7873/1180951/1200160121/99962587251231955979753667848833 : 2C2CBFC151043709 | | 2017-09-21 | Oliver Kruse | C-PRP | M7873/known_factors : 2C2CBFC151043709 |
|
