Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 561: | \[{8^{561}-1\over7}\] | 23 × 73 × 89 × 103 × 199 × 919 × 2143 × 11119 × 131071 × 146983 × 153649 × 599479 × 707983 × 33057806959<11> × 2009643799642447<16> × 75582488424179347083438319<26> × 1032670816743843860998850056278950666491537<43> × 12648384035384787780871703134944437615763117128688347014641503430279486998671<77> × 11115748792959075541413638382507379013799719163835094332248283675181497110153638438297977063974079498963827970464427090405324250841764548315131889374138004468724634195653470352201865342442681781048410276214777088206589716214890893308638317906880755244354527997114336872455652032511337300041<290> |