Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 374: | \[{20^{374}-1\over19}\] | 3 × 7 × 23 × 1871 × 1059169 × 2567783 × 2640509 × 92054423 × 424016563147<12> × 451401795703<12> × 3571056289901<13> × 10778947368421<14> × 689852631578947368421<21> × 6913322791967175382572187129<28> × 2196154391828173826895678932804683444062056269214484206836036858619<67> × 946214414819739287364909489682759246183695543785025925009153013550103388149060967080691722150595073193559921117023171419666269<126> × 4642727848267836393989217829328215794606056493635787320089769075915673139967953944862178631569633619593631151038094053649633925916015346627661289700149532671716107<163> |