Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 621: | \[{20^{621}-1\over19}\] | 139 × 421 × 691 × 1381 × 4969 × 31051 × 509221 × 64008001 × 879338701 × 119553964489<12> × 235475206489<12> × 113317059163579<15> × 298114935351301<15> × 4892995476168664219561<22> × 46266279097921483078651<23> × 887612944642122132741202450909<30> × 2184862032570422308074444966133284250690548357572266405681628366683042273433433463998738991787340358680001832686449969881551801182126914937648421<145> × [4442101815049899244972532646641868867205527246328742100938375976629880608803486391728477463176332893978365051405105600042194327504374572848300831446003928240550015106854498377108534617618075189278346785194579380820967637783207972886969689907900613866030366937460385360527745354608808711869834457954285870973648873860036116908443955171475989225753296448798806451289413187228232106707140213879670477463882955106493047512482214457579631819268284627248788676992872062164324592135273533828173260906211<496>] |