Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 214: | \[{20^{214}-1\over19}\] | 3 × 7 × 643 × 190568071 × 91228439433259<14> × 112740560139749<15> × 2164736618242110538930702807<28> × 1135729165952506357316267228281<31> × 2319984034880283356779488842089<31> × 172032094957736670443161396409653114394358511<45> × 210675692283856066917581972804853794363830391609<48> × 2532712448923566121530103988251057499783567701628648305451<58> |