| 2308247 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 129 / 640 |
Estimated T-Level: 26.0 ⓘ TF below 2^81 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 |
|---|
| Factored | PRP without proof (not generated) | 2017-10-11 | Oliver Kruse | 661E966C9036EFFE | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-22 | storm5510 | 661E966C9036EFFE | 1 | 1550249 | 1 | 3 | | Verified | Certified Good | 2025-10-27 | DanB | 6B1132E230AB9EFB | 2 | 1442056 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-10-27 | mister_phil | CERT | Proof certified good | | 2025-10-27 | DanB | C-PRP | Proof Certified Good
Proof Power: 7
| | 2025-10-21 | TJAOI | F-ECM | Factor: 562956541808059108829941439279 / ECM curve 13, B1=250000, B2=264647565, Edwards Sigma=5669064159219939 | | 2021-04-09 | ViliamF | NF-PM1 | B1=5000000, B2=505000000 | | 2018-02-21 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 | | 2017-11-22 | storm5510 | C-PRP | M2308247/240057689 : 661E966C9036EFFE | | 2017-10-11 | Oliver Kruse | C-PRP | M2308247/240057689 : 661E966C9036EFFE |
|
