Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{21^{248}-1\over20}\] | 23 × 11 × 13 × 17 × 66713 × 78059 × 92753 × 97241 × 4540713283<10> × 38051727977<11> × 3936833990413<13> × 272581865551637989<18> × 13163658325422541897<20> × 56748249908554278937564172324714039<35> × 263790388079541107039607586199349904436518481062297<51> × 12188176972724438859190363353452951593240181197213410628079185314296593302329089148160983925682797097180620013780637241688663969329091267042196825513<149> |