| 1397983 | Composite: proven not-prime with both PRP and Lucas-Lehmer tests No factors below 268 TF target 260 |
| P-1 | | B1 = | 22500000 | | B2 = | 115536843240 |
|
| 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 |
|---|
| Verified | | Joel Armengaud | F3E7E4DDE6AC189C | 0 | Windows,Prime95,v13,(aka WP1) | | Bad | | Dwayne Towell | F427ECDEE6EC189D | 0 | Mac,John Sweeney,v1.4,(aka J3) | | Verified | | Tom Cage | F3E7E4DDE6AC189C | 0 | Glucas with shift counts,(aka G29) | | Verified | 2015-03-28 | MadPoo 🙂 | F3E7E4DDE6AC189C | 193829 | Windows 64-bit,Prime95,v26,(aka We4) | | Verified | 2018-07-12 | kkmrkkblmbrbk | F3E7E4DDE6AC189C | 240828 | Windows 64-bit,Prime95,v29.4,build 5 |
|
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Verified | Certified Good Power=6 | 2020-11-07 | Ethan O'Connor | 5A1EBDB01DB79F0F | 535882 | 1 | 3 | | Verified | Certified Good Power=6 | 2025-09-01 | Kriesel | 5A1EBDB01DB79F0F | 0 | 1 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Carlos Pinho | CERT | Proof certified good | | 2025-09-01 | Kriesel | C-PRP | 5A1EBDB01DB79F0F Proof Certified Good
Proof Power: 6
| | 2023-10-06 | Sid & Andy | NF-PM1 | B1=22500000, B2=115536843240 | | 2023-06-18 | Joss | NF-PM1 | B1=1397983, B2=18738449730 | | 2023-01-30 | Joss | NF-PM1 | B1=1397983, B2=3483900420 | | 2022-12-20 | Joss | NF-PM1 | B1=1397983, B2=1268467200 | | 2020-11-08 | ATH | CERT | Proof certified good | | 2020-11-07 | Ethan O'Connor | C-PRP | 5A1EBDB01DB79F0F Proof Certified Good
Proof Power: 6
| | 2020-02-28 | Gordon Spence | NF | no factor TF: 67-68 | | 2018-10-14 | Joss | NF-PM1 | B1=1397983, B2=153778130, E=12 | | 2018-10-07 | Joss | NF-PM1 | B1=1397983, B2=27959660, E=12 | | 2018-10-05 | Joss | NF-PM1 | B1=1397983, B2=13979830, E=12 | | 2018-07-12 | kkmrkkblmbrbk | C-LL | F3E7E4DDE6AC189C | | 2018-04-02 | TJAOI | NF | no factor TF: 66-67 | | 2016-02-23 | Mark Rose | NF | no factor TF: 59-60 | | 2015-09-25 | ramgeis | NF | no factor TF: 65-66 | | 2015-04-19 | snme2pm1 | NF | no factor TF: 64-65 | | 2015-04-19 | snme2pm1 | NF | no factor TF: 63-64 | | 2015-03-28 | MadPoo 🙂 | C-LL | F3E7E4DDE6AC189C | | 2014-10-04 | mikr | NF-PM1 | B1=3106900, B2=111849000, E=12 | | 2014-09-22 | Joss | NF-PM1 | B1=222896 | | 2014-05-19 | Joss | NF-PM1 | B1=176984 | | 2013-01-27 | dbaugh | NF | no factor TF: 62-63 | | 2012-07-03 | Grant McCracken | NF | no factor TF: 61-62 | | 2009-02-15 | Sturle Sunde | NF | no factor TF: 60-61 | | 2003-09-21 | Team Prime Rib | NF-PM1 | B1=15000, B2=202500 | | 2003-09-21 | megavink | NF-PM1 | B1=15000, B2=202500 | | 2003-03-27 | -anonymous- | NF | no factor TF: 1-59 | | 2003-02-24 | -anonymous- | NF | no factor TF: 1-58 | | 2003-02-16 | -anonymous- | NF-PM1 | B1=4096, B2=409600, E=12 | | 2003-02-09 | -anonymous- | NF-PM1 | B1=2048, B2=204800, E=12 | | 2001-10-27 | -anonymous- | NF | no factor TF: 1-57 | | 2001-10-27 | -anonymous- | NF | no factor TF: 1-57 |
|
