Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 173: | \[{18^{173}-1\over17}\] | 1039 × 12457 × 184073 × 85205658777352805361851273<26> × 16000644557667169300792913112120863<35> × 263068859906097132789560415847731867269488175651689589598960919119815674997561793737851379009598349628832109977084440227106298615542413861531031<144> |