Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[{20^{217}-1\over19}\] | 29 × 71 × 311 × 11161 × 32719 × 70309 × 1646101 × 340037881769<12> × 581740080393079<15> × 1927096019169236362594991761<28> × 10745052699002910129003668482388390030218734404937467827141999461783912866121555666061234127793659610943368649030436190633227762371243769637775186473952158110711591702374739679837830619006220683480361369<203> |