Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 83: | \[{18^{83}-1\over17}\] | 167 × 59263 × 86802964875867109109279559751944809<35> × 10547130976787567739760741415960485703934860841255807268617487<62> |