Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 355: | \[{7^{355}-1\over6}\] | 2131 × 2801 × 25561 × 990643452963163<15> × 56289276349396871456041<23> × 8626512997499727156919264091<28> × 76517845980555473610468712199440815091<38> × 3173000019403116087424802551781937763200511<43> × 169002145064468556765676975247413756542145739<45> × 641713853752178839895479942132287119308113963511<48> × 88213243899351338201032020013436824870798391653571<50> |