| 1881071 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 261 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 107 / 640 |
Estimated T-Level: 25.8 ⓘ TF below 2^81 is very unlikely to find new factors due to ECM effort. |
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-02 | Kriesel | 55183B965B04AED5 | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2017-10-04 | Oliver Kruse | 36918B5E84477EEC | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-08 | kkmrkkblmbrbk | 36918B5E84477EEC | 1 | 751600 | 1 | 3 | | Verified | Certified Good | 2020-08-13 | storm5510 | 55183B965B04AED5 | 2 | 497718 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Carlos Pinho | CERT | Proof certified good | | 2025-09-02 | Kriesel | C-PRP | 55183B965B04AED5 Proof Certified Good
Proof Power: 6
| | 2020-08-13 | Team_Inspector | CERT | Proof certified good | | 2020-08-13 | storm5510 | C-PRP | M1881071/15048569/121995345526816009441 : 55183B965B04AED5 Proof Certified Good
Proof Power: 7
| | 2020-08-13 | TJAOI | F | Factor: 121995345526816009441 | | 2017-11-08 | kkmrkkblmbrbk | C-PRP | M1881071/15048569 : 36918B5E84477EEC | | 2017-10-04 | Oliver Kruse | C-PRP | M1881071/15048569 : 36918B5E84477EEC | | 2016-03-16 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 |
|
