Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 580: | \[{20^{580}-1\over19}\] | 3 × 7 × 11 × 41 × 59 × 61 × 251 × 401 × 929 × 1741 × 2801 × 10789 × 143609 × 152381 × 222361 × 346261 × 1063721 × 466307299 × 500140961 × 42516584771<11> × 71353204641689<14> × 286934932103531<15> × 10940140435272203<17> × 134223608855082547<18> × 25104088611489177761<20> × 2511778854830594606611<22> × 312853876283494435841671<24> × 692012806659357739574341<24> × 19840908591991639613963221<26> × 374751027121579773391551841<27> × 14539465911516540927768942989234881<35> × 538183971558805833828812947515874242761<39> × 572054927334156496925012920235629192230281168555441<51> × 275237350188210195072284862579981234396868532708331534708262055043682150160128281356531921<90> × [185889541598689893183686640276398231384253598705735396482803805269110948021500575453346430468477451292372241380378381300575638689958783879776398373382846179296441403884448598079547491849883579743556500650826786351520367094419150536443300339397404675770675921<258>] |