Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
85: | \[{18^{85}-1\over17}\] | 17 × 41 × 1361 × 2711 × 3911 × 3462391 × 5124991 × 10275311 × 23718627631<11> × 7563707819165039903<19> × 8923131267608947348958760704450309227970561<43> |