Base 23 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
57: | \[{23^{57}-1\over22}\] | 7 × 79 × 2129 × 63877469 × 2350382803 × 24939218613613<14> × 1420450672756039<16> × 3015559345436616275558557<25> |