Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 321: | \[{21^{321}-1\over20}\] | 463 × 1734899 × 4272624310883<13> × 352523466309500183<18> × 55837009494804076861723<23> × 16339864316070753885738065827<29> × 62966131031683950925080167776709767184533584081571817<53> × 19469198903927901997312301427648927586066999038931036844178183592001543766368078073110601552323367227795281844800273492257723215052135262091968430434941714697650666592870872096083502123708001004135994439420403282968025329097749187158157783862306004952326951763773697423948381354521<281> |