| 1951 | Composite, with 2 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 | 16550 / 16550 | | 55 | 110000000 | 40830 / 40830 | | 60 | 260000000 | 105362 / 105362 | | 65 | 800000000 | 67282 / 194238 |
Estimated T-Level: 61.7 ⓘ TF below 2^200 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 | 3B7287ECAEA2F16F | 2 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-10-02 | kkmrkkblmbrbk | 3B7287ECAEA2F16F | 2 | 0 | 1 | 3 | | Verified | No proof (small exponent) | 2017-12-07 | ATH | 3B7287ECAEA2F16F | 2 | 1689 | 1 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | E274CBC4D3DA66F9 | 2 | 1026 | 5 | 3 | | Verified | No proof (small exponent) | 2020-08-12 | _p95holder_ | E274CBC4D3DA66F9 | 2 | 1682 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2023-02-06 | mikr | NF-PM1 | B1=500000000000, B2=3291057749991451440 | | 2021-07-26 | ViliamF | NF-PP1 | Start=2/7, B1=1000000000, B2=221000000000 | | 2020-08-12 | _p95holder_ | C-PRP | M1951/16866820319/16297294059349258932713984073367 : E274CBC4D3DA66F9 | | 2020-04-17 | Oliver Kruse | C-PRP | M1951/16866820319/16297294059349258932713984073367 : E274CBC4D3DA66F9 | | 2017-12-07 | ATH | C-PRP | M1951/16866820319/16297294059349258932713984073367 : 3B7287ECAEA2F16F | | 2017-10-02 | kkmrkkblmbrbk | C-PRP | M1951/16866820319/16297294059349258932713984073367 : 3B7287ECAEA2F16F | | 2017-09-21 | Oliver Kruse | C-PRP | M1951/known_factors : 3B7287ECAEA2F16F | | 2016-09-07 | kkmrkkblmbrbk | NF-PM1 | B1=1000000000, B2=100000000000, E=12 |
|
