Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 153: | \[{18^{153}-1\over17}\] | 73 × 17 × 103 × 919 × 991 × 34327 × 10413571416962911<17> × 7563707819165039903<19> × 25383561616923867703<20> × 12987756239101305138847<23> × 213818099127345344099315823804116404264567927<45> × 642944494183502925312626186377796650764383068861962559<54> |