| 7520573 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 270 TF target 267 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 6 / 280 |
Estimated T-Level: 20.1 ⓘ TF below 2^62 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-10-21 | Mason Guy | C781682C30B54B03 | 5094044 | Linux 32-bit,Prime95,v18,(aka WU2) | | Factored | 2002-02-17 | Marc Getty / Phil Fizur | C781682C30B54B03 | 6562083 | Windows,Prime95,v21,NT service,(aka WX5) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2020-06-01 | ATH | 00909C0089765D15 | 1 | 5788325 | 5 | 3 | | Verified | PRP without proof (not generated) | 2020-06-03 | daveward2005 | 00909C0089765D15 | 1 | 6952118 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-10-17 | Sid & Andy | NF-PM1 | B1=2500000, B2=3943416750 | | 2025-06-18 | Greg | F | Factor: 447058373634791783023 / TF: 68-70 | | 2020-06-03 | daveward2005 | C-PRP | M7520573/447058373634791783023 : 00909C0089765D15 | | 2020-06-01 | ATH | C-PRP | M7520573/447058373634791783023 : 00909C0089765D15 | | 2020-05-31 | chuenkit | F | Factor: 447058373634791783023 / TF: 68-69* | | 2018-07-31 | ramgeis | NF | no factor TF: 67-68 | | 2016-09-23 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-06-09 | VictordeHollander | NF | no factor TF: 65-66 | | 2013-12-06 | David Campeau | NF | no factor TF: 64-65 | | 2013-10-18 | Nesowa | NF | no factor TF: 63-64 | | 2012-05-03 | James Heinrich | NF-PM1 | B1=145000, B2=3153750, E=6 | | 2002-02-17 | -anonymous- | C-LL | C781682C30B54B03 | | 2002-02-10 | -anonymous- | NF-PM1 | B1=40000, B2=530000 | | 1999-10-21 | Mason | C-LL | C781682C30B54B03 | | 1998-08-30 | -anonymous- | NF | no factor TF: 1-63 | | 1998-08-09 | -anonymous- | NF | no factor TF: 1-62 |
|
