Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
213: | \[{3^{213}-1\over2}\] | 13 × 5113 × 22716867932413<14> × 115264393627813<15> × 3613512804721129<16> × 89665588664737776553<20> × 3754733257489862401973357979128773<34> |