Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 122: | \[{8^{122}-1\over7}\] | 32 × 367 × 55633 × 768614336404564651<18> × 2305843009213693951<19> × 37201708625305146303973352041<29> × 1772303994379887829769795077302561451<37> |