Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 223: | \[{19^{223}-1\over18}\] | 2677 × 3705121363 × 7579985624053<13> × [1073152189946273040285318333892021299949822575679938562284843027285041639277678941659892681332408582489057388401453925914342927697560828340302188340943951821639755912364572212054957143934319456424852062887579472965908078867755317447301578350454594360346458527<259>] |