| 2558203 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 263 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 176 / 280 |
Estimated T-Level: 23.1 ⓘ TF below 2^72 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Christopher Kolar | 40C00E727BED2687 | 0 | Linux 32-bit,Prime95,v13,(aka WP2) | | Factored | 1999-03-26 | Bruce Mitchell | 40C00E727BED2687 | 2261480 | Windows,Prime95,v17,(aka WT1) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2017-10-15 | Oliver Kruse | D54D442D93F5B892 | 1 | 443090 | 5 | 3 | | Verified | PRP without proof (not generated) | 2017-12-01 | storm5510 | D54D442D93F5B892 | 1 | 901955 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2022-03-11 | LordJulius | NF | no factor TF: 1-60 | | 2019-07-04 | alpertron | NF-PM1 | B1=2000000, B2=60000000, E=12 | | 2017-12-01 | storm5510 | C-PRP | M2558203/1426838864532133513957871 : D54D442D93F5B892 | | 2017-10-15 | Oliver Kruse | C-PRP | M2558203/1426838864532133513957871 : D54D442D93F5B892 | | 2009-02-15 | eteo | F-ECM | Factor: 1426838864532133513957871 | | 2009-02-02 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-11-08 | Team Prime Rib | NF-PM1 | B1=15000, B2=198750 | | 2003-10-23 | -anonymous- | NF-PM1 | B1=2048, B2=204800 | | 1999-03-26 | -anonymous- | C-LL | 40C00E727BED2687 | | 1999-03-15 | -anonymous- | NF | no factor TF: 1-59 |
|
