Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
89: | \[{19^{89}-1\over18}\] | 179 × 100406562593700976489171<24> × 1991511641305906595444902842736305161490856691155674104014444795547589309174118116074569<88> |