| 5515217 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 272 TF target 266 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 100 / 280 |
Estimated T-Level: 21.8 ⓘ TF below 2^67 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-10-21 | Wu Xiao | 136A0F89CB321D78 | 0 | Windows,Prime95,v16,NT service,(aka WS5) | | Factored | 2000-11-05 | Marc Getty / Phil Fizur | 136A0F89CB321D78 | 395512 | Windows,Prime95,v20,(aka WW1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-04-01 | Perig | 4A08AC5EA7BF0087 | 1 | 3125463 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-01 | Georg_Edelmann | CERT | Proof certified good | | 2025-04-01 | Perig | C-PRP | M5515217/7968087614981340997992817 : 4A08AC5EA7BF0087 Proof Certified Good
Proof Power: 7
| | 2025-03-27 | fordobr | F-ECM | Factor: 7968087614981340997992817 / ECM curve 47, B1=50000, B2=64857975, Edwards Sigma=2292786036131271 | | 2021-10-21 | axn | NF-PM1 | B1=8000000, B2=400000000 | | 2021-09-19 | SRBase | NF | no factor TF: 71-72 | | 2021-08-23 | SRBase | NF | no factor TF: 70-71 | | 2021-08-19 | SRBase | NF | no factor TF: 69-70 | | 2020-08-24 | TJAOI | NF | no factor TF: 68-69 | | 2019-09-08 | GdS | NF-PM1 | B1=200000, B2=6000000 | | 2018-07-05 | ramgeis | NF | no factor TF: 67-68 | | 2016-07-17 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-08-30 | snme2pm1 | NF | no factor TF: 65-66 | | 2014-12-05 | monst | NF | no factor TF: 64-65 | | 2014-12-04 | Nesowa | NF | no factor TF: 63-64 | | 2010-11-22 | Squeeky_Squirrel | NF-PM1 | B1=60000, B2=1035000, E=6 | | 2009-04-28 | GrunwalderGIMP | NF | no factor TF: 62-63 | | 2000-11-05 | -anonymous- | C-LL | 136A0F89CB321D78 | | 2000-10-28 | -anonymous- | NF-PM1 | B1=20000, B2=60000 | | 2000-07-17 | Team_Deutschland | NF-PM1 | B1=25000, B2=300000 | | 1999-10-21 | -anonymous- | C-LL | 136A0F89CB321D78 | | 1998-11-07 | -anonymous- | C-LL | B4634B8E010D9C__ | | 1998-04-11 | -anonymous- | NF | no factor TF: 1-62 |
|
