Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | \[{18^{255}-1\over17}\] | 73 × 17 × 31 × 41 × 103 × 601 × 1361 × 2711 × 3911 × 6121 × 8161 × 558721 × 3462391 × 5124991 × 10275311 × 23718627631<11> × 1489856496481<13> × 3464341027951<13> × 10413571416962911<17> × 7563707819165039903<19> × 12987756239101305138847<23> × 8923131267608947348958760704450309227970561<43> × 194222124196373149048899990715569585764334013126562349943474447981960390158818731928321366135005208531160308426948367095164044241<129> |