Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 283: | \[{7^{283}-1\over6}\] | 644316289 × 182739497717749501<18> × 205902934361811678298102407850776182717715918337281553010436129812676082445469860026804559798463949182486188966249385770154788528257434633845693930756578115254940189805467995982547010128631464485400679593806467213<213> |