| 5215801 | Composite: proven not-prime with Lucas-Lehmer test No factors below 272 TF target 266 |
| P-1 | | B1 = | 7000000 | | B2 = | 5981471760 |
|
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 60 / 640 |
Estimated T-Level: 25.5 ⓘ TF below 2^80 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Verified | 1999-01-10 | Sean Roulet | 25997DED8793A6F5 | 0 | Windows,Prime95,v16,(aka WS1) | | Verified | 2000-08-10 | David Linton | 25997DED8793A6F5 | 3969099 | Windows,Prime95,v19,(aka WV1) |
|
| History | | Date | User | Type | Result |
|---|
| 2022-06-22 | Sid & Andy | NF-PM1 | B1=7000000, B2=5981471760 | | 2021-09-17 | SRBase | NF | no factor TF: 71-72 | | 2018-12-30 | King | NF-PM1 | B1=500000, B2=12000000 | | 2016-01-10 | ramgeis | NF | no factor TF: 70-71 | | 2015-08-27 | ramgeis | NF | no factor TF: 69-70 | | 2015-08-27 | ramgeis | NF | no factor TF: 68-69 | | 2015-08-27 | ramgeis | NF | no factor TF: 67-68 | | 2015-07-06 | Numberwang | NF | no factor TF: 66-67 | | 2015-01-24 | Numberwang | NF | no factor TF: 65-66 | | 2014-12-22 | VictordeHollander | NF | no factor TF: 64-65 | | 2014-12-22 | VictordeHollander | NF | no factor TF: 63-64 | | 2010-06-10 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=975000, E=6 | | 2009-08-20 | Carsten Kossendey | NF-PM1 | B1=25000, B2=337500 | | 2009-06-18 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-08-10 | -anonymous- | C-LL | 25997DED8793A6F5 | | 1999-01-10 | -anonymous- | C-LL | 25997DED8793A6F5 | | 1998-05-23 | -anonymous- | NF | no factor TF: 1-62 | | 1998-03-31 | Sturle Sunde | NF | no factor TF: 1-61 |
|
