Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 305: | \[{8^{305}-1\over7}\] | 31 × 151 × 367 × 1831 × 2441 × 4271 × 55633 × 270841 × 360511 × 484074637694471<15> × 2305843009213693951<19> × 37201708625305146303973352041<29> × 95805951836468022966692945378791<32> × 8013930086014783164580302226587271<34> × 364371848053973128400380293624417256758401<42> × 19120725947222519095879164245102731413110415053568518849342625278699572681<74> |