| 1663 | Composite, with 4 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 244 |
| Factored | |
| P-1 factors | | Date | Factors | B1 | B2 |
|---|
| 2024-05-02 | No new factors discovered | 50000 | 50000 |
|
| 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 | 40830 / 40830 | | 60 | 260000000 | 105362 / 105362 | | 65 | 800000000 | 158507 / 194238 |
Estimated T-Level: 64.1 ⓘ TF below 2^208 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 | 5D0711F2C0B0F3E1 | 4 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-02 | kkmrkkblmbrbk | 5D0711F2C0B0F3E1 | 4 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-12-07 | ATH | 5D0711F2C0B0F3E1 | 4 | 1625 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | 103BC2BB744C2644 | 4 | 443 | 5 | 3 | | Verified | No proof (small exponent) | 2020-08-12 | _p95holder_ | 103BC2BB744C2644 | 4 | 1303 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2024-05-02 | JuanTutors | F-PM1 | Factors: 16631,6013409,5958582126199 / B1=50000 | | 2024-03-02 | masser | NF-PM1 | B1=250000000000, B2=378945708521480100 | | 2021-07-22 | ViliamF | NF-PP1 | Start=2/7, B1=1000000000, B2=221000000000 | | 2020-08-12 | _p95holder_ | C-PRP | M1663/16631/6013409/5958582126199/234340138207259893603519423288297 : 103BC2BB744C2644 | | 2020-04-17 | Oliver Kruse | C-PRP | M1663/16631/6013409/5958582126199/234340138207259893603519423288297 : 103BC2BB744C2644 | | 2017-12-07 | ATH | C-PRP | M1663/16631/6013409/5958582126199/234340138207259893603519423288297 : 5D0711F2C0B0F3E1 | | 2017-10-02 | kkmrkkblmbrbk | C-PRP | M1663/16631/6013409/5958582126199/234340138207259893603519423288297 : 5D0711F2C0B0F3E1 | | 2017-09-21 | Oliver Kruse | C-PRP | M1663/known_factors : 5D0711F2C0B0F3E1 | | 2016-09-07 | kkmrkkblmbrbk | NF-PM1 | B1=1000000000, B2=100000000000, E=12 |
|
