| 5505883 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 59 / 280 |
Estimated T-Level: 21.1 ⓘ TF below 2^65 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-09-22 | Mike | B0835325E63F6AC1 | 3690010 | Linux 32-bit,Prime95,v18,(aka WU2) | | Factored | 2000-09-29 | Adam Murray | B0835325E63F6AC1 | 5411555 | Windows,Prime95,v20,(aka WW1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-04-01 | Ashton | D01E1B256A958CE6 | 1 | 1278968 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-01 | twmoss | CERT | Proof certified good | | 2025-04-01 | Ashton | C-PRP | M5505883/5755570229891213166823 : D01E1B256A958CE6 Proof Certified Good
Proof Power: 7
| | 2025-03-25 | fordobr | F-ECM | Factor: 5755570229891213166823 / ECM curve 26, B1=50000, B2=64857975, Edwards Sigma=1724152034158165 | | 2022-09-09 | Sid & Andy | NF-PM1 | B1=7000000, B2=5996001660 | | 2021-09-19 | SRBase | NF | no factor TF: 71-72 | | 2021-08-24 | SRBase | NF | no factor TF: 70-71 | | 2021-08-18 | SRBase | NF | no factor TF: 69-70 | | 2020-11-15 | Dylan Delgado | NF-PM1 | B1=1000000, B2=20000000 | | 2020-08-31 | TJAOI | NF | no factor TF: 68-69 | | 2019-09-08 | GdS | NF-PM1 | B1=200000, B2=6000000 | | 2018-07-05 | ramgeis | NF | no factor TF: 67-68 | | 2016-07-14 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-08-30 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-12-03 | monst | NF | no factor TF: 64-65 | | 2014-12-02 | Nesowa | NF | no factor TF: 63-64 | | 2010-11-20 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=975000, E=6 | | 2009-05-01 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-09-29 | -anonymous- | C-LL | B0835325E63F6AC1 | | 2000-07-17 | -anonymous- | NF-PM1 | B1=25000, B2=225000 | | 1999-09-22 | -anonymous- | C-LL | B0835325E63F6AC1 | | 1998-04-05 | -anonymous- | NF | no factor TF: 1-62 |
|
