Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
83: | \[{7^{83}-1\over6}\] | 167 × 66733 × 76066181 × 7685542369<10> × 62911130477521<14> × 303567967057423<15> × 18624275418445601<17> |