Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
191: | \[{7^{191}-1\over6}\] | 383 × 35546396841548971517329<23> × 3173803489575951310503002636086462973878287955904248765684822807946528763568758821448698318364736060112432098446485259066897122628577351<136> |