Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 143: | \[{8^{143}-1\over7}\] | 23 × 79 × 89 × 8191 × 121369 × 599479 × 724153 × 17286204937<11> × 158822951431<12> × 5782172113400990737<19> × 1065107717756542892882802586807<31> × 167833515549285827885461382441449<33> |