Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
153: | \[{8^{153}-1\over7}\] | 73 × 103 × 919 × 2143 × 11119 × 131071 × 262657 × 407770693450231393<18> × 24418671951944649151<20> × 75582488424179347083438319<26> × 49848448234572624009465371493197779785120970152607<50> |