Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 391: | \[{18^{391}-1\over17}\] | 17 × 47 × 599 × 15641 × 72727 × 7468009 × 30984689431<11> × 20801237997245359<17> × 7563707819165039903<19> × [192305132726976910611480725301870951560866666540529785766013099739059813273673145879574829314613995386665113266343171714327095865722444460009249815311787087018291159761456120922702923132921426039139616410161286281756180245634247306525391674453367934628853158881693667277763447812338306880830604645967365268554124815693635330685417151299340378561307162436715371642820233071967099986776935876572130501150756224205790623084503<423>] |