Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 149: | \[{7^{149}-1\over6}\] | 138502212710103408700774381033135503926663324993317631729227790657325163310341833227775945426052637092067324133850503035623601<126> |