Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
97: | \[{18^{97}-1\over17}\] | 3881 × 130958018700810567361260919261914712849<39> × 6682028674792021850499658634432979974620281094975260236296555044282940787318279<79> |