Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 149: | \[{18^{149}-1\over17}\] | 2087 × 842447 × 6240284418223<13> × 28836157900907730847114445717893484522671774404847044330042019761653582081<74> × 2018122491762343197805930625100210720290856702932504476857000473154311310882324551290888793<91> |