Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
191: | \[{20^{191}-1\over19}\] | 473879719151<12> × 206106071370102461<18> × 2719296984436768443179989571440201152269496972209<49> × 9138297627872532133669115036986038024460302995357320339911159668210928262651<76> × 6806043548170093585152859058434168023575926679460161252008124337816002222018380422457267311029<94> |