Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{18^{248}-1\over17}\] | 52 × 13 × 19 × 113 × 311 × 373 × 929 × 1427 × 1489 × 6449 × 12959 × 70619 × 1158037 × 89891941 × 1276827537047<13> × 9365578696924149281<19> × 844025609171791028413<21> × 427906142457974033788659934939<30> × 63023759457096932797215924793101340357<38> × 447001932443218306813660347673349027827467893483654520855584317249101798995308208260074275516345536799936043292782207148888326889108447261389041<144> |