| 15721967 | Composite: proven not-prime with Lucas-Lehmer test No factors below 273 TF target 269 |
| P-1 | | B1 = | 1500000 | | B2 = | 1391923260 |
|
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 1 / 280 |
Estimated T-Level: 20.0 ⓘ TF below 2^61 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Verified | 2002-07-27 | Tom Womack | 0000090B8846CDE4 | 14857022 | Linux 32-bit,Prime95,v20,(aka WW2) | | Verified | 2006-01-15 | liang | 0000090B8846CDE4 | 5778389 | Windows,Prime95,v24 final,(aka Wc1) |
|
| History | | Date | User | Type | Result |
|---|
| 2024-07-21 | Sid & Andy | NF-PM1 | B1=1500000, B2=1391923260 | | 2021-02-08 | Yxinity | NF | no factor TF: 72-73 | | 2021-02-03 | Yxinity | NF | no factor TF: 71-72 | | 2018-10-16 | Yxinity | NF | no factor TF: 70-71 | | 2016-03-16 | Mark Rose | NF | no factor TF: 65-66 | | 2015-12-23 | Tha | NF-PM1 | B1=300000, B2=6000000, E=12 | | 2015-11-24 | ramgeis | NF | no factor TF: 69-70 | | 2015-10-14 | Bruno Victal | NF | no factor TF: 68-69 | | 2015-10-14 | Bruno Victal | NF | no factor TF: 67-68 | | 2014-07-10 | Nesowa | NF | no factor TF: 66-67 | | 2006-01-15 | -anonymous- | C-LL | 0000090B8846CDE4 | | 2002-07-27 | -anonymous- | C-LL | 0000090B8846CDE4 | | 2002-05-25 | -anonymous- | NF-PM1 | B1=235000, B2=235000 | | 2001-06-23 | irreally9002 | NF | no factor TF: 1-65 | | 2001-01-28 | Net_Force | NF | no factor TF: 1-58 |
|
