Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 123: | \[{7^{123}-1\over6}\] | 3 × 19 × 83 × 267403 × 20515909 × 4362139336229068656094783<25> × 130316122780975961361639346994021774533656192933498430337748067<63> |