Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[{7^{217}-1\over6}\] | 29 × 311 × 4733 × 21143 × 604997 × 1956808820481173<16> × 3999088279399464409<19> × 602858801824822604293<21> × 626475940065539137153553<24> × 14784849807251837047947491359227676537<38> × 17000527701935476130693003872474495857034746189773<50> |