Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
65: | \[{18^{65}-1\over17}\] | 41 × 79 × 521 × 911 × 2711 × 29759719289<11> × 260674349667764744544365521<27> × 7122627224638909118690351246321<31> |