| 8263 | Composite, with 1 known prime factor. 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 | 6938 / 16550 |
Estimated T-Level: 47.1 ⓘ TF below 2^151 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 | F12B86BF6B06571F | 1 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-12 | kkmrkkblmbrbk | F12B86BF6B06571F | 1 | 4598 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | E448390EA45F5096 | 1 | 7191 | 5 | 3 | | Verified | No proof (small exponent) | 2024-07-01 | kkmrkkblmbrbk | E448390EA45F5096 | 1 | 5251 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-05-19 | masser | NF-PP1 | Start=192/29, B1=1300000000, B2=1298700000000 | | 2024-07-01 | kkmrkkblmbrbk | C-PRP | M8263/163604664259317708257 : E448390EA45F5096 | | 2023-08-30 | JacobZ | NF-PM1 | B1=71000000000, B2=265422648792401100 | | 2021-12-16 | ANONYMOUS | NF-PM1 | B1=100000000 | | 2020-04-17 | Oliver Kruse | C-PRP | M8263/163604664259317708257 : E448390EA45F5096 | | 2017-10-12 | kkmrkkblmbrbk | C-PRP | M8263/163604664259317708257 : F12B86BF6B06571F | | 2017-09-21 | Oliver Kruse | C-PRP | M8263/163604664259317708257 : F12B86BF6B06571F | | 2017-09-21 | Oliver Kruse | C-PRP | M8263/163604664259317708257 : F12B86BF6B06571F |
|
