Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 171: | \[{8^{171}-1\over7}\] | 73 × 32377 × 57457 × 262657 × 524287 × 1212847 × 93507247 × 35473416481<11> × 121323854647<12> × 2237717449946593<16> × 3042645634792541312037847<25> × 61641347592475860688686002670152525762503468748858717047<56> |