Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
52: | \[{23^{52}-1\over22}\] | 24 × 3 × 5 × 53 × 157 × 2861561 × 47691619 × 278640181 × 480393499 × 3829141917458729<16> × 21001515080686141<17> |