| 3890521 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 271 TF target 264 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 239 / 280 |
Estimated T-Level: 24.3 ⓘ TF below 2^76 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1998-03-09 | Rich Baker | A934C88DBD945E1C | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1999-08-31 | Andre Gerhard | A934C88DBD945E1C | 3169748 | Linux 32-bit,Prime95,v18,(aka WU2) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | Certified Good | 2025-03-21 | fordobr | 72DEBFB06DAF9E1C | 1 | 2842111 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-03-21 | Manfred_Bruder_01-05-1988_DE | CERT | Proof certified good | | 2025-03-21 | fordobr | C-PRP | M3890521/151290104792104575094675487 : 72DEBFB06DAF9E1C Proof Certified Good
Proof Power: 7
| | 2025-03-21 | fordobr | F-ECM | Factor: 151290104792104575094675487 / ECM curve 28, B1=109333, B2=211882125, Edwards Sigma=4882853728702718 | | 2022-10-13 | Joss | NF-PM1 | B1=1355622, B2=1014017550 | | 2022-09-03 | Joss | NF-PM1 | B1=1355622, B2=215130300 | | 2022-06-02 | DRobinsonPE | NF-PM1 | B1=19000000, B2=121717565970 | | 2022-02-09 | Joss | NF-PM1 | B1=1355622, B2=134904000 | | 2021-03-02 | axn | NF-PM1 | B1=15000000, B2=750000000 | | 2021-02-08 | axn | NF | no factor TF: 70-71 | | 2021-02-08 | axn | NF | no factor TF: 69-70 | | 2020-11-23 | Carlos Pinho | NF-PM1 | B1=171000, B2=4733000 | | 2020-09-07 | TJAOI | NF | no factor TF: 68-69 | | 2018-10-22 | TJAOI | NF | no factor TF: 67-68 | | 2016-11-29 | Gordon Spence | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2016-02-15 | ramgeis | NF | no factor TF: 65-66 | | 2016-02-06 | Joss | NF-PM1 | B1=228096, B2=2280960, E=6 | | 2015-01-18 | VictordeHollander | NF | no factor TF: 64-65 | | 2015-01-18 | VictordeHollander | NF | no factor TF: 63-64 | | 2014-10-28 | Joss | NF-PM1 | B1=86498 | | 2012-04-20 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2011-10-12 | Squeeky_Squirrel | NF-PM1 | B1=70000, B2=1155000, E=6 | | 2011-02-14 | markr | NF | no factor TF: 61-62 | | 2009-07-31 | Carsten Kossendey | NF-PM1 | B1=20000, B2=275000 | | 2009-02-25 | S485122 | NF | no factor TF: 60-61 | | 1999-08-31 | -anonymous- | C-LL | A934C88DBD945E1C | | 1998-03-17 | -anonymous- | NF | no factor TF: 1-60 | | 1998-03-09 | -anonymous- | NF | no factor TF: 1-60 | | 1998-03-09 | -anonymous- | C-LL | A934C88DBD945E1C |
|
