Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 218: | \[{28^{218}-1\over27}\] | 29 × 1091 × 117721 × 10549457 × 116573926477<12> × 258694036490465188007661621181<30> × 24652851471194674096518495172640669<35> × 31215766331257946957942729353107254419588492535361428593<56> × 1963462180676064596958518582997946825547322996309731299402231907<64> × 62535802620990949936746430170545667663012473464884933074454722350506559649629260520569707876000143234381<104> |