Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
68: | \[{19^{68}-1\over18}\] | 23 × 5 × 1372 × 181 × 3044803 × 99995282631947<14> × 3084256577008769<16> × 274019342889240109297<21> × 1433250916087597060721<22> |