Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
141: | \[{18^{141}-1\over17}\] | 73 × 20681 × 66271 × 2265788967915227678109312241889713<34> × 1168075952295286774045290370148972359<37> × 164553564709154162283579361428414340468207<42> × 283000552804612324998031105442040281801013193565594903<54> |