| 2278207 | 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 | 121 / 640 |
Estimated T-Level: 25.9 ⓘ 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 | EA5DED78F06BC90E | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-21 | storm5510 | EA5DED78F06BC90E | 1 | 2004165 | 1 | 3 | | Verified | Certified Good | 2025-01-26 | Wojciech Florek | 01936E89825CE840 | 2 | 158852 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-01-26 | ANONYMOUS | CERT | Proof certified good | | 2025-01-26 | Wojciech Florek | C-PRP | M2278207/145805249/283461765466785686990081303 : 01936E89825CE840 Proof Certified Good
Proof Power: 7
| | 2025-01-26 | Wojciech Florek | F-ECM | Factor: 283461765466785686990081303 / ECM curve 12, B1=83156, B2=28687050, Edwards Sigma=8533045188200078 | | 2017-11-21 | storm5510 | C-PRP | M2278207/145805249 : EA5DED78F06BC90E | | 2017-10-11 | Oliver Kruse | C-PRP | M2278207/145805249 : EA5DED78F06BC90E | | 2016-04-08 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 |
|
