Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 268: | \[{20^{268}-1\over19}\] | 3 × 7 × 269 × 401 × 906779 × 607366391 × 155933666228489<15> × 1675321819620801402895922892830936675785863439805780007540110904579241<70> × 2028091958451738612859850293757703424325148440435452811067937144771409<70> × 141027529625834791277325880782894530434550121999834925322075700531980089<72> × 2677857134043589993545040721495322330987682407965218365255254239632565751984708459261701324651703353889<103> |