| 2258617 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 130 / 640 |
Estimated T-Level: 26.0 ⓘ TF below 2^81 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Stephen Nichols | 44DCAD4A99F484B9 | 0 | Windows,Prime95,v13,(aka WP1) | | Factored | 1999-03-26 | Edward Quan | 44DCAD4A99F484B9 | 1108749 | 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) | 2017-10-10 | Oliver Kruse | E61E051C25E2EEBC | 1 | 0 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-11-21 | storm5510 | E61E051C25E2EEBC | 1 | 716004 | 1 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2017-11-21 | storm5510 | C-PRP | M2258617/1889953351406337539177 : E61E051C25E2EEBC | | 2017-10-10 | Oliver Kruse | C-PRP | M2258617/1889953351406337539177 : E61E051C25E2EEBC | | 2016-04-14 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 | | 2009-12-31 | James Hintz | F-ECM | Factor: 1889953351406337539177 | | 2009-01-11 | Sturle Sunde | NF | no factor TF: 60-61 | | 1999-03-26 | ANONYMOUS | C-LL | 44DCAD4A99F484B9 |
|
