Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 638: | \[{20^{638}-1\over19}\] | 3 × 7 × 23 × 59 × 929 × 1741 × 10789 × 143609 × 321187703 × 466307299 × 3340057601 × 4624681447<10> × 424016563147<12> × 10778947368421<14> × 71353204641689<14> × 10940140435272203<17> × 134223608855082547<18> × 3357700530367808543515169<25> × [4089831285245999338608848853988119548252095540884218366459588241329258705614960473417725114007712366392965925379173787882388368136937149586079036812418248580554710868308679039512523120477128844091855415805668267879284032311415210108919467776775848999866652312389264741828910282722987412797835634143894247365919595361177749<322>] × [5525459941355219846033552331009445364481844332208454577473130068761741838171384796921022795402734792586928908957961625075433914062904932173803668771741754927965755542884878214633189023436499655210941103970125820360914615099062055987845370546817254471702656867885078631249474749286651471352276813672812874640192447869224683874014032989248164238470567654381<355>] |