Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 61: | \[{23^{61}-1\over22}\] | 5266228211<10> × 4217468380980037880092527701441161<34> × 237916085520023302947010376750220097331<39> |