Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
214: | \[{7^{214}-1\over6}\] | 23 × 1499 × 82413922847<11> × 227109283745807808529<21> × 1620221568881364582821<22> × 1206506689449517154664984054683391885701717268373<49> × 2695243919434392578158999979834635005950141263938710984020428459530739329431<76> |