Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 77: | \[{8^{77}-1\over7}\] | 7 × 23 × 89 × 127 × 337 × 463 × 599479 × 581283643249112959<18> × 4982397651178256151338302204762057<34> |