| 1888807 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 261 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 107 / 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 | | John Leser | 7DF22B34831C827D | 0 | Windows,Prime95,v13,(aka WP1) | | Factored | 1998-03-17 | Dongsheng Liu | 7DF22B34831C827D | 0 | Windows,Prime95,v14,(aka WQ1) | | Factored | 1998-12-21 | David Underbakke | 7DF22B34831C827D | 788328 | Windows,Prime95,v17,(aka WT1) | | Factored | 2016-06-02 | MadPoo 🙂 | 7DF22B34831C827D | 515038 | Windows 64-bit,Prime95,v26,(aka We4) |
|
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-02 | Kriesel | 866565255673C755 | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | PRP without proof (not generated) | 2017-11-28 | Oliver Kruse | 866565255673C755 | 1 | 986204 | 5 | 3 | | Verified | PRP without proof (not generated) | 2017-11-28 | storm5510 | 866565255673C755 | 1 | 194934 | 5 | 3 | | Verified | Not Uploaded | 2022-02-04 | LordJulius | 866565255673C755 | 1 | 477522 | 5 | 3 | | Verified | Certified Good | 2022-10-20 | LordJulius | 866565255673C755 | 1 | 152721 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Carlos Pinho | CERT | Proof certified good | | 2025-09-02 | Kriesel | C-PRP | 866565255673C755 Proof Certified Good
Proof Power: 6
| | 2022-10-20 | daekaz | CERT | Proof certified good | | 2022-10-20 | LordJulius | C-PRP | M1888807/17570894921137193094967 : 866565255673C755 Proof Not Uploaded
Proof Power: 7
| | 2022-02-04 | LordJulius | C-PRP | M1888807/17570894921137193094967 : 866565255673C755 Proof Not Uploaded
Proof Power: 7
| | 2017-11-28 | storm5510 | C-PRP | M1888807/17570894921137193094967 : 866565255673C755 | | 2017-11-28 | Oliver Kruse | C-PRP | M1888807/17570894921137193094967 : 866565255673C755 | | 2017-11-26 | bam | F-ECM | Factor: 17570894921137193094967 | | 2017-04-29 | Joss | NF-PM1 | B1=1492992, B2=14929920, E=12 | | 2017-03-07 | Joss | NF-PM1 | B1=1244160, B2=12441600, E=12 | | 2017-01-21 | Joss | NF-PM1 | B1=1036800 | | 2016-12-29 | Joss | NF-PM1 | B1=864000 | | 2016-12-23 | Joss | NF-PM1 | B1=720000 | | 2016-10-07 | Joss | NF-PM1 | B1=500000, B2=19800000, E=6 | | 2016-09-22 | Joss | NF-PM1 | B1=500000, B2=16500000, E=12 | | 2016-06-02 | MadPoo 🙂 | C-LL | 7DF22B34831C827D | | 2016-02-23 | Mark Rose | NF | no factor TF: 61-62 | | 2016-02-23 | Mark Rose | NF | no factor TF: 62-63 | | 2016-02-23 | Mark Rose | NF | no factor TF: 58-60 | | 2015-10-08 | Bruno Victal | NF-PM1 | B1=500000, B2=15000000, E=12 | | 2015-09-13 | ramgeis | NF | no factor TF: 65-66 | | 2015-05-11 | snme2pm1 | NF | no factor TF: 64-65 | | 2015-05-11 | snme2pm1 | NF | no factor TF: 63-64 | | 2012-01-18 | markr | NF-PM1 | B1=275000, B2=6000000, E=12 | | 2011-03-08 | GrunwalderGIMP | NF | no factor TF: 1-63 | | 2010-03-31 | -anonymous- | NF | no factor TF: 60-61 | | 2003-01-09 | -anonymous- | NF | no factor TF: 1-58 | | 1998-12-21 | -anonymous- | C-LL | 7DF22B34831C827D | | 1998-03-17 | -anonymous- | NF | no factor TF: 1-57 | | 1998-03-17 | -anonymous- | C-LL | 7DF22B34831C827D |
|
