Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 321: | \[{7^{321}-1\over6}\] | 3 × 19 × 643 × 859121000285791<15> × 23884590227767303<17> × 477280063808143381<18> × 1842220342523756359<19> × 227109283745807808529<21> × 1620221568881364582821<22> × 1206506689449517154664984054683391885701717268373<49> × 10730198025352317025440239990612887002644333899521305232793262178976733077193646658160210079258835226940868129<110> |