| 1388041 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 260 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 105 / 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 | | Erich Steinboeck | 62F52C0D66A582AC | 0 | Windows,Prime95,v13,(aka WP1) | | Factored | | Cornelius Caesar | 62F52C0D66A582AC | 0 | Mac,John Sweeney,vLL1.0b1,(aka J4) | | Factored | 2008-06-03 | Brian J. Beesley | 62F52C0D66A582AC | 662399 | Linux 32-bit,Prime95,v24 final,(aka Wc2) |
|
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-01 | Kriesel | 69A42510CD0846D3 | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2017-09-30 | Oliver Kruse | 43B30AA320BC8B6C | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-10-25 | Chang Chia-Tche | 43B30AA320BC8B6C | 1 | 158775 | 1 | 3 | | Verified | PRP without proof (not generated) | 2018-12-09 | Oliver Kruse | 69A42510CD0846D3 | 2 | 25216 | 5 | 3 | | Verified | PRP without proof (not generated) | 2018-12-10 | storm5510 | 69A42510CD0846D3 | 2 | 188754 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Carlos Pinho | CERT | Proof certified good | | 2025-09-01 | Kriesel | C-PRP | 69A42510CD0846D3 Proof Certified Good
Proof Power: 6
| | 2024-04-29 | USAFSS | NF-PM1 | B1=576000, B2=1362065250 | | 2022-03-07 | LordJulius | NF | no factor TF: 58-60 | | 2018-12-10 | storm5510 | C-PRP | M1388041/4391295404605338623/1944759137765174739007 : 69A42510CD0846D3 | | 2018-12-09 | Oliver Kruse | C-PRP | M1388041/4391295404605338623/1944759137765174739007 : 69A42510CD0846D3 | | 2018-12-07 | TJAOI | F-ECM | Factor: 1944759137765174739007 | | 2017-10-25 | Chang Chia-Tche | C-PRP | M1388041/4391295404605338623 : 43B30AA320BC8B6C | | 2017-09-30 | Oliver Kruse | C-PRP | M1388041/4391295404605338623 : 43B30AA320BC8B6C | | 2011-04-23 | James Hintz | F-ECM | Factor: 4391295404605338623 | | 2009-02-19 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-09-21 | megavink | NF-PM1 | B1=15000, B2=228750 | | 2003-09-21 | Team Prime Rib | NF-PM1 | B1=15000, B2=228750 | | 2003-07-06 | -anonymous- | NF | no factor TF: 1-58 | | 2001-11-03 | -anonymous- | NF | no factor TF: 1-57 |
|
