Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
58: | \[{18^{58}-1\over17}\] | 19 × 59 × 1505548068007783<16> × 98800490511312118297<20> × 2255781524824231358697279947382689<34> |