Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
109: | \[{20^{109}-1\over19}\] | 62131 × 1407409 × 30141718771<11> × 129604250659026736109701065421661563297127174485218222239267216986597196453680196268568077889400721838664795338799261869<120> |