Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
40: | \[{23^{40}-1\over22}\] | 25 × 3 × 52 × 31 × 41 × 53 × 61 × 211 × 941 × 5081 × 139921 × 272341 × 292561 × 1206964869343609001<19> |