Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 434: | \[{21^{434}-1\over20}\] | 2 × 11 × 43 × 631 × 3319 × 3907 × 11719 × 78059 × 81867661 × 4540713283<10> × 57897596401<11> × 3936833990413<13> × 1327673263118497<16> × 37391106152229551<17> × 272581865551637989<18> × 56748249908554278937564172324714039<35> × 1844299007032373076846655934009031991<37> × 84845193781010150935676027148732557958347095338405197115142184728787472503865504557463709634588421811120100878117230159549154644555211644083836856335834777364695510001743187985811<179> × [4833342712063691572096837908842408644067936196457257466623053869469663808074454140112575877506981270571751724352626249779546673083198560974926702102353184065971466742701435691922898425790185165539389078253589351<211>] |