Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 496: | \[{21^{496}-1\over20}\] | 24 × 11 × 13 × 17 × 62897 × 66713 × 78059 × 92753 × 97241 × 300673 × 4540713283<10> × 38051727977<11> × 42095579521<11> × 3936833990413<13> × 1345350384451889<16> × 272581865551637989<18> × 1044010272122690209<19> × 13163658325422541897<20> × 54827331489756799287992788673<29> × 56748249908554278937564172324714039<35> × 263790388079541107039607586199349904436518481062297<51> × 12188176972724438859190363353452951593240181197213410628079185314296593302329089148160983925682797097180620013780637241688663969329091267042196825513<149> × 66352448820933669851026763292745692596021670220959987369718869324404838474327010971067157834793245286270025973629728845665161072637135427652020931168849346899606248172729622247021256626114854808027519518821923471961257766401906590908847968932497<245> |