Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 510: | \[{21^{510}-1\over20}\] | 2 × 5 × 11 × 31 × 103 × 211 × 421 × 463 × 1361 × 1531 × 2551 × 3061 × 9391 × 11969 × 18181 × 38047 × 40841 × 185641 × 342211 × 501001 × 25402591 × 3549804001 × 39748187549971<14> × 25505004968999551<17> × 114089969144083169<18> × 1502097124754084594737<22> × 51233569124705721849500009982296618143<38> × 74260138157554946742618541154360105011<38> × 11500287881306297400572689205013166485061<41> × 20813096623337757798888685318376525907607<41> × 346846213951614446714019035689488886491130381<45> × 64256472775653024242865342688900540000034949794499961<53> × 14923927201647231692066520884112168808387109788676424881<56> × 1146508751145828427797368997863961140165497772622968624509039040111346066151<76> × 83064341690084723243222862579624955608825430140451274312701165552608685728436984601948049090906312508129515442953525398241865902069270571531<140> |