| 3181879 | Composite: proven not-prime with Lucas-Lehmer test No factors below 271 TF target 264 |
| P-1 | | B1 = | 10200000 | | B2 = | 19598847450 |
|
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 109 / 640 |
Estimated T-Level: 25.9 ⓘ TF below 2^81 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Verified | 1998-04-15 | Stephan Grupp | B685BC5D9A24FB6F | 0 | Windows,Prime95,v15,(aka WR1) | | Verified | 1999-08-07 | Andras Posafalvi | B685BC5D9A24FB6F | 1264611 | Windows,Prime95,v18,(aka WU1) |
|
| History | | Date | User | Type | Result |
|---|
| 2025-07-17 | Architects Cubed | NF | no factor TF: 70-71 | | 2023-02-25 | Sid & Andy | NF-PM1 | B1=10200000, B2=19598847450 | | 2022-12-02 | TJAOI | NF | no factor TF: 69-70 | | 2022-10-14 | Joss | NF-PM1 | B1=1001448, B2=1015265790 | | 2022-02-09 | Joss | NF-PM1 | B1=1001448, B2=119912100 | | 2021-07-22 | TJAOI | NF | no factor TF: 68-69 | | 2021-02-15 | Numberwang | NF-PM1 | B1=166000, B2=5240000 | | 2019-09-19 | mikr | NF-PM1 | B1=3000000, B2=120000000 | | 2019-01-07 | TJAOI | NF | no factor TF: 67-68 | | 2017-04-26 | Gordon Spence | NF | no factor TF: 66-67 | | 2016-03-07 | Joss | NF-PM1 | B1=681448, B2=12266064, E=6 | | 2015-11-21 | Joss | NF-PM1 | B1=567874 | | 2015-09-17 | Joss | NF-PM1 | B1=450362 | | 2015-06-18 | Tha | NF | no factor TF: 65-66 | | 2015-02-15 | VictordeHollander | NF | no factor TF: 64-65 | | 2015-02-15 | VictordeHollander | NF | no factor TF: 63-64 | | 2014-09-29 | Joss | NF-PM1 | B1=100344 | | 2014-06-01 | Joss | NF-PM1 | B1=80172 | | 2013-01-03 | dbaugh | NF | no factor TF: 62-63 | | 2011-10-24 | Grant McCracken | NF | no factor TF: 61-62 | | 2011-09-12 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=975000, E=6 | | 2009-07-03 | Carsten Kossendey | NF-PM1 | B1=15000, B2=191250 | | 2009-04-08 | S485122 | NF | no factor TF: 60-61 | | 2004-02-14 | -anonymous- | NF-PM1 | B1=2048, B2=204800 | | 2001-07-07 | David Campeau | NF | no factor TF: 1-60 | | 1999-08-07 | -anonymous- | C-LL | B685BC5D9A24FB6F | | 1998-04-15 | Stephan Grupp | C-LL | B685BC5D9A24FB6F |
|
