| 1026391 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 271 TF target 260 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 100 / 640 |
Estimated T-Level: 25.8 ⓘ TF below 2^81 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Peter Frostad | 27DA60494FAB8EBA | 0 | Windows 16-bit,Prime95,v11,(aka WB) | | Factored | | David Slowinski | EBA | 0 | Cray,Slowinski,(aka D4) | | Factored | 2002-01-28 | S57483 | 27DA60494FAB8EBA | 722929 | Linux 32-bit,Prime95,v21,(aka WX2) |
|
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-01 | Kriesel | 66E794B776B5C2DA | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2017-10-05 | Oliver Kruse | 14B8C749F68313E8 | 2 | 0 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-10-15 | Oliver Kruse | 14B8C749F68313E8 | 2 | 485426 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-12-27 | ATH | 14B8C749F68313E8 | 2 | 909259 | 1 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-01 | Joan Gayon | CERT | Proof certified good | | 2025-09-01 | Kriesel | C-PRP | 66E794B776B5C2DA Proof Certified Good
Proof Power: 6
| | 2022-03-07 | LordJulius | NF | no factor TF: 58-60 | | 2021-07-14 | ViliamF | NF-PM1 | B1=10000000, B2=1000000000 | | 2017-12-27 | ATH | C-PRP | M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8 | | 2017-10-15 | Oliver Kruse | C-PRP | M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8 | | 2017-10-05 | Oliver Kruse | C-PRP | M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8 | | 2017-09-28 | Oliver Kruse | C-PRP | M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8 | | 2017-04-21 | TJAOI | F-ECM | Factor: 77255756150014562665997791 | | 2015-03-05 | Jason U | F-ECM | Factor: 1565518816363569144767 | | 2014-12-02 | Joss | NF-PM1 | B1=1026391 | | 2014-10-17 | Joss | NF-PM1 | B1=325066 | | 2014-07-18 | Joss | NF-PM1 | B1=262533 | | 2014-04-01 | Never Odd Or Even | NF | no factor TF: 70-71 | | 2013-07-17 | Never Odd Or Even | NF | no factor TF: 69-70 | | 2013-07-17 | Never Odd Or Even | NF | no factor TF: 68-69 | | 2013-04-13 | Never Odd Or Even | NF | no factor TF: 67-68 | | 2013-04-13 | Never Odd Or Even | NF | no factor TF: 66-67 | | 2013-04-13 | Never Odd Or Even | NF | no factor TF: 65-66 | | 2013-04-13 | Never Odd Or Even | NF | no factor TF: 64-65 | | 2012-01-01 | bcp19 | NF-PM1 | B1=200000, B2=10000000, E=12 | | 2010-11-23 | Michael C | NF | no factor TF: 63-64 | | 2010-11-23 | Michael C | NF | no factor TF: 62-63 | | 2010-11-07 | Michael C | NF | no factor TF: 61-62 | | 2009-02-14 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-11-16 | -anonymous- | NF-PM1 | B1=2048, B2=204800 | | 2003-02-02 | -anonymous- | NF | no factor TF: 1-58 | | 2002-11-16 | Joss | NF-PM1 | B1=20000 | | 2002-10-07 | Joss | NF-PM1 | B1=15000 | | 2002-01-28 | -anonymous- | C-LL | 27DA60494FAB8EBA | | 2002-01-22 | Joss | NF-PM1 | B1=10000, B2=127500 | | 2001-11-03 | -anonymous- | NF | no factor TF: 1-57 |
|
