Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 148: | \[{7^{148}-1\over6}\] | 24 × 52 × 149 × 223 × 2887 × 4805345109492315767981401<25> × 15572244900182528777225808449<29> × 6891042949305882214394659726647344864958515967158596120016737<61> |