Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
109: | \[{28^{109}-1\over27}\] | 1091 × 117721 × 258694036490465188007661621181<30> × 31215766331257946957942729353107254419588492535361428593<56> × 1963462180676064596958518582997946825547322996309731299402231907<64> |