Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 441: | \[{20^{441}-1\over19}\] | 29 × 71 × 421 × 1471 × 6679 × 32719 × 460951 × 64008001 × 269737651 × 8442733531<10> × 2488859795549<13> × 32865566462821<14> × 6551154092925933298930251891324599<34> × 10287600958458182504983419994609358363826919<44> × 13149431066432694799534977107679246791059834401228556359210092801566281439371614848468492182188987082746431<107> × 220200238615058921483749936318196734865602531252683377016218526108625107636692633916046176821214017519381253777563503037506344609313500899681683470064225995668197545842348656521934486255475137555726081982622755096338637351160859626282200391912609739871392582673245958842930989910711907974881796928652613697024681581<315> |