Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 651: | \[{20^{651}-1\over19}\] | 29 × 71 × 311 × 421 × 1489 × 11161 × 32719 × 70309 × 460951 × 1646101 × 2870356651 × 8442733531<10> × 340037881769<12> × 6360660215911<13> × 581740080393079<15> × 6958865125585715161<19> × 3216069644332011401131<22> × 1927096019169236362594991761<28> × 735669815930822532937503688968508571966425959548932871142136554846387363229<75> × 10745052699002910129003668482388390030218734404937467827141999461783912866121555666061234127793659610943368649030436190633227762371243769637775186473952158110711591702374739679837830619006220683480361369<203> × [6049488008506739955016917183811810928941191704010209635368663775091730974911142797797577872183317617155931215100350113149744279617617406832623798085441708780636962592757699046891951850996029420897976155130616037584497529912226165853499888636824964603974328988659758721571626218318534981943591650376928881288597823674481664676026925544599176768158390170218602098606814155455383224132359119512860106031470371<406>] |