Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 151: | \[{7^{151}-1\over6}\] | 115356256117<12> × 36076003832567<14> × 206462520503013793561<21> × 2856349001315592319937<22> × 2765290231620224523441852435124159094999555183731339173137659<61> |