| 2258657 | 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 | 163 / 640 |
Estimated T-Level: 26.3 ⓘ TF below 2^82 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) | 2017-10-10 | Oliver Kruse | 29A987D4B6FA592D | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-21 | storm5510 | 29A987D4B6FA592D | 1 | 1579881 | 1 | 3 | | Verified | Certified Good | 2025-01-07 | MarkS | 83D21C10BC33DDA0 | 2 | 1627832 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-07 | Xyzzy | CERT | Proof certified good | | 2025-01-07 | MarkS | C-PRP | M2258657/140321324783/5413849171678720504591 : 83D21C10BC33DDA0 Proof Certified Good
Proof Power: 7
| | 2025-01-07 | MarkS | F-ECM | Factor: 5413849171678720504591 / ECM curve 11, B1=84464, B2=117709515, Edwards Sigma=4045072729402491 | | 2017-11-21 | storm5510 | C-PRP | M2258657/140321324783 : 29A987D4B6FA592D | | 2017-10-10 | Oliver Kruse | C-PRP | M2258657/140321324783 : 29A987D4B6FA592D | | 2016-04-14 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 |
|
