Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 406: | \[{20^{406}-1\over19}\] | 3 × 72 × 292 × 59 × 71 × 827 × 929 × 1741 × 10529 × 10789 × 32719 × 143609 × 466307299 × 71353204641689<14> × 175898867958283<15> × 10940140435272203<17> × 134223608855082547<18> × 416342986893831527394682060819665340624809379247669<51> × 143898718736967326644103759009524395515229793952770451037038868341<66> × 204576949613262569842922274426200752428775161825247204534907214162447891577218079001650264666147359641<102> × 2233394929527357146428772017317400493723991711748668557934213105147742115471774515441749136798724947155509590848913366462550592790012745175099929710345810480363080972321152682914828869823587676085775841887<205> |