| 81561761 | Tested as composite (unverified): unconfirmed Lucas-Lehmer test says not-prime No factors below 276 TF target 275 |
| P-1 | |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Unverified | 2017-10-23 | mathprofrockstar | 2D64DD3F7BF7F0__ | 75293436 | Windows 64-bit,Prime95,v26.6,build 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-10-08 | Sid & Andy | NF | no factor TF: 75-76 | | 2017-10-23 | mathprofrockstar | C-LL | 2D64DD3F7BF7F0__ | | 2017-05-22 | TheJudger | NF-PM1 | B1=695000, B2=14247500, E=12 | | 2016-10-14 | -anonymous- | NF | no factor TF: 74-75 | | 2016-10-14 | -anonymous- | NF | no factor TF: 73-74 | | 2016-10-14 | -anonymous- | NF | no factor TF: 72-73 | | 2016-10-14 | -anonymous- | NF | no factor TF: 71-72 | | 2015-06-30 | monst | NF | no factor TF: 70-71 | | 2014-02-03 | Thomas Kerscher | NF | no factor TF: 69-70 | | 2014-02-02 | Thomas Kerscher | NF | no factor TF: 68-69 | | 2014-02-01 | Thomas Kerscher | NF | no factor TF: 67-68 | | 2013-01-30 | phoenicis | NF | no factor TF: 66-67 | | 2012-08-09 | Carsten Kossendey | NF | no factor TF: 65-66 | | 2010-12-15 | Architects Cubed | NF | no factor TF: 64-65 |
|
