Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 195: | \[{20^{195}-1\over19}\] | 11 × 31 × 61 × 79 × 131 × 251 × 421 × 521 × 1171 × 3001 × 3121 × 3511 × 4421 × 90481 × 142559 × 261451 × 403261 × 9690539 × 4470064171<10> × 12831155611<11> × 144142570154831<15> × 37217519646710509861<20> × 4329520082233745656921<22> × 172311318287603732461390609<27> × 11477196436840183082171551292108543731<38> × 37728220072591903594777394062315785248115734924892661<53> |