Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 218: | \[{20^{218}-1\over19}\] | 3 × 7 × 62131 × 1407409 × 30141718771<11> × 4853627033268486638270881579845190453048400476241956095380999221327<67> × 63677181431547620972356130946468691723801632219555526905162653245522049203<74> × 129604250659026736109701065421661563297127174485218222239267216986597196453680196268568077889400721838664795338799261869<120> |