Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 51: | \[{19^{51}-1\over18}\] | 3 × 103 × 127 × 307 × 613 × 3044803 × 54474019 × 99995282631947<14> × 74657245773488638417876963<26> |