Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 67: | \[{23^{67}-1\over22}\] | 269 × 2152900439563539121<19> × 1350722411768113885790624753062895918883814157448379863553859994476957<70> |