| 1629581 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 261 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 137 / 640 |
Estimated T-Level: 26.1 ⓘ TF below 2^82 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | George Woltman | EEBE9076B41CD837 | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-04-23 | David Campeau | EEBE9076B41CD837 | 748316 | Windows,Prime95,v18,NT service,(aka WU5) | | Factored | 1999-05-16 | Scott Reeves | EEBE9076B41CD837 | 572607 | Linux 32-bit,Prime95,v17,(aka WT2) |
|
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-02 | Kriesel | C4A228AAF7F9A01D | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2017-11-21 | storm5510 | C4A228AAF7F9A01D | 1 | 11097 | 5 | 3 | | Verified | PRP without proof (not generated) | 2017-11-22 | Oliver Kruse | C4A228AAF7F9A01D | 1 | 459341 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | KIM | CERT | Proof certified good | | 2025-09-02 | Kriesel | C-PRP | C4A228AAF7F9A01D Proof Certified Good
Proof Power: 6
| | 2017-11-22 | Oliver Kruse | C-PRP | M1629581/9490341778933116013149161 : C4A228AAF7F9A01D | | 2017-11-21 | storm5510 | C-PRP | M1629581/9490341778933116013149161 : C4A228AAF7F9A01D | | 2017-11-21 | VictordeHollander | F-ECM | Factor: 9490341778933116013149161 | | 2017-11-10 | TJAOI | NF | no factor TF: 66-67 | | 2017-09-05 | Joss | NF-PM1 | B1=2000000, B2=20000000, E=12 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2016-02-23 | Mark Rose | NF | no factor TF: 61-62 | | 2016-02-23 | Mark Rose | NF | no factor TF: 58-60 | | 2015-10-11 | ramgeis | NF | no factor TF: 65-66 | | 2015-05-03 | monst | NF | no factor TF: 64-65 | | 2015-05-02 | omylist | NF | no factor TF: 63-64 | | 2011-12-10 | BigBrother | NF-PM1 | B1=1000000, B2=20000000, E=12 | | 2010-08-31 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2010-05-07 | Architects Cubed | NF | no factor TF: 60-61 | | 2003-06-23 | -anonymous- | NF | no factor TF: 1-58 | | 1999-05-16 | -anonymous- | C-LL | EEBE9076B41CD837 | | 1999-04-23 | David Campeau | C-LL | EEBE9076B41CD837 | | 1998-11-07 | Brap_On | NF | no factor TF: 1-57 |
|
