Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 290: | \[{20^{290}-1\over19}\] | 3 × 7 × 11 × 59 × 61 × 251 × 929 × 1741 × 10789 × 143609 × 152381 × 346261 × 466307299 × 42516584771<11> × 71353204641689<14> × 286934932103531<15> × 10940140435272203<17> × 134223608855082547<18> × 2511778854830594606611<22> × 312853876283494435841671<24> × 692012806659357739574341<24> × 19840908591991639613963221<26> × 374751027121579773391551841<27> × 572054927334156496925012920235629192230281168555441<51> × 275237350188210195072284862579981234396868532708331534708262055043682150160128281356531921<90> |