Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
197: | \[{7^{197}-1\over6}\] | 3547 × 6159369299<10> × 232683292217642138595953315056613657221228158541002854819879191464035680885762530508884195267925669155660603700337646661960049381253408876099900115205617<153> |