Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 212: | \[{7^{212}-1\over6}\] | 24 × 52 × 107 × 8269 × 15053 × 319591 × 7627549 × 345449549 × 35416476134069<14> × 58902316970027001503<20> × 38904276017035188056372051839841219<35> × 66284833432285160162590803535350777411419371011803789028357303049568916086249<77> |