Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 423: | \[{21^{423}-1\over20}\] | 463 × 49727 × 227011 × 38571961 × 75042551 × 85775383 × 158545759 × 5298873343<10> × 62754239731<11> × 226700458471<12> × 26050530648193<14> × 471375279539413<15> × 63104490505375993<17> × 85297241991463563433<20> × 9794718038248648833094153<25> × 16557682722621587651041257050155686425265489802868579623<56> × [5983644535879899665489422699034362153550823276640571979408927555768343447264268515744237716365146938944250345019643095519020202505387232217662437018070088377916895621736327268514986578399051162637673774468133382151006955259781216230306035044552219673333970757513603588761078934533262372963856599990319504153467418947695938818234324840887<337>] |