Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 58: | \[{20^{58}-1\over19}\] | 3 × 7 × 59 × 929 × 1741 × 10789 × 143609 × 466307299 × 71353204641689<14> × 10940140435272203<17> × 134223608855082547<18> |