Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 74: | \[{19^{74}-1\over18}\] | 22 × 5 × 149 × 3588174588084451<16> × 21406757809476033811281103559<29> × 10300379826060720504760427912621791994517454717<47> |