Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 187: | \[{8^{187}-1\over7}\] | 23 × 89 × 103 × 2143 × 11119 × 131071 × 146983 × 599479 × 707983 × 2009643799642447<16> × 1032670816743843860998850056278950666491537<43> × 12648384035384787780871703134944437615763117128688347014641503430279486998671<77> |