Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{18^{155}-1\over17}\] | 41 × 311 × 2711 × 12959 × 316201 × 466062991 × 1107229481 × 1276827537047<13> × 9365578696924149281<19> × 4069317457763949581396117495290099929231469953601<49> × 6105344706161177496018405856657758633903569370324868785524181487043204770666481<79> |