Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 62: | \[{18^{62}-1\over17}\] | 19 × 311 × 1427 × 12959 × 70619 × 1276827537047<13> × 9365578696924149281<19> × 427906142457974033788659934939<30> |