Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 201: | \[{20^{201}-1\over19}\] | 421 × 1609 × 906779 × 411097261 × 607366391 × 834559639 × 156462958559288859033910810561734571<36> × 141027529625834791277325880782894530434550121999834925322075700531980089<72> × 59891857171161501501315138418750680677450229812760115826534668862079486815843797317174249429547839237253782294900301<116> |