Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 145: | \[{8^{145}-1\over7}\] | 31 × 151 × 233 × 1103 × 2089 × 4177 × 9857737155463<13> × 256582225885581001782477601<27> × 2679895157783862814690027494144991<34> × 178137551056208627463817592059032323866951<42> |