Base 9 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 73: | \[{9^{73}-1\over8}\] | 439 × 11243 × 20149 × 15768033143<11> × 9460375336977361<16> × 38488154120055537150068589763279<32> |