Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
56: | \[{19^{56}-1\over18}\] | 24 × 5 × 17 × 29 × 181 × 197 × 701 × 3833 × 5237 × 70841 × 226871 × 14533200697<11> × 4898725341275828472027787456561<31> |