| 4531867 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 273 TF target 265 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 118 / 280 |
Estimated T-Level: 22.1 ⓘ TF below 2^68 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-05-16 | Mark Alfonso | 6CB0E3A3718D0B4A | 0 | Windows,Prime95,v15,(aka WR1) | | Factored | 1999-12-23 | Bengt Månsson | 6CB0E3A3718D0B4A | 3493223 | Windows,Prime95,v18,(aka WU1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-15 | fordobr | 688363A4BD14565F | 1 | 2936414 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-15 | David Strube | CERT | Proof certified good | | 2025-03-15 | fordobr | C-PRP | M4531867/25813104857836763219522657 : 688363A4BD14565F Proof Certified Good
Proof Power: 7
| | 2025-03-15 | fordobr | F-ECM | Factor: 25813104857836763219522657 / ECM curve 22, B1=69679, B2=60054225, Edwards Sigma=8217321603463338 | | 2023-02-07 | Sid & Andy | NF-PM1 | B1=4400000, B2=11419636800 | | 2021-02-17 | -anonymous- | NF | no factor TF: 72-73 | | 2021-02-06 | -anonymous- | NF | no factor TF: 71-72 | | 2021-01-27 | -anonymous- | NF | no factor TF: 70-71 | | 2021-01-27 | -anonymous- | NF | no factor TF: 69-70 | | 2021-01-27 | -anonymous- | NF | no factor TF: 68-69 | | 2018-05-21 | ramgeis | NF | no factor TF: 67-68 | | 2018-05-21 | ramgeis | NF | no factor TF: 66-67 | | 2017-02-01 | Ismo Laitela | NF-PM1 | B1=1988203, B2=61634303, E=12 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2015-06-29 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-11-11 | lycorn | NF | no factor TF: 64-65 | | 2014-11-11 | Jayder | NF | no factor TF: 63-64 | | 2011-12-28 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2010-09-09 | markr | NF | no factor TF: 61-62 | | 2010-08-19 | markr | NF-PM1 | B1=90000, B2=2002500, E=6 | | 2002-01-15 | David Campeau | NF | no factor TF: 1-61 | | 1999-12-23 | -anonymous- | C-LL | 6CB0E3A3718D0B4A | | 1998-05-16 | -anonymous- | C-LL | 6CB0E3A3718D0B4A |
|
