Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 428: | \[{20^{428}-1\over19}\] | 3 × 7 × 401 × 643 × 32957 × 42373 × 190568071 × 91228439433259<14> × 112740560139749<15> × 2164736618242110538930702807<28> × 1135729165952506357316267228281<31> × 2319984034880283356779488842089<31> × 172032094957736670443161396409653114394358511<45> × 210675692283856066917581972804853794363830391609<48> × 2532712448923566121530103988251057499783567701628648305451<58> × [470151487417860625522049223863198951511197604017349840236195666547690462797024103845851373121935063703843772955725943740617582429489428136022349610688720522112159658141368356098832875286588765455134131315230052211299470687143784214345537358601543297171935506332082241<267>] |