Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{23^{81}-1\over22}\] | 7 × 19 × 79 × 4591 × 7792003 × 14945797 × 15785281 × 44765293701223<14> × 59679899512256809<17> × 1088774249552970415950511<25> × 35157512647661402580746419<26> |