Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[{18^{121}-1\over17}\] | 23 × 199 × 727 × 16127 × 51217 × 103577 × 586367 × 27227533543753365982438399708085484080831743771008849850932265278999273377354114546362618762214332158687286162186495539771649<125> |