Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 346: | \[{21^{346}-1\over20}\] | 2 × 11 × 347 × 1039 × 2547599 × 12761810683477<14> × 3956658511154887<16> × 36502415754011189<17> × 114983422063191099936091634498136270710100968230735265578439191<63> × 946545933133851067986018421923330681730547286842908589819715975345332245491807955621547125989615345481172266563524635583004511802633134764693908050800371173037<159> × 379321807802407391932814777895452252926814343365701905116931352834480243154857440966022170594177077203987537567422411189781513653736189240042567792580923327339974073590197494267<177> |