Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 67: | \[{18^{67}-1\over17}\] | 864167 × 14184594510552113<17> × 562081533912939823<18> × 10829165718047954727946216809876203820917671<44> |