Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 71: | \[{23^{71}-1\over22}\] | 2131 × 351156543156995844791<21> × 12689965311931555366531418920750153<35> × 23052022067431050825264764433875832941<38> |