Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 206: | \[{7^{206}-1\over6}\] | 23 × 1031 × 17923 × 490201721 × 1058638292629<13> × 461785968654529<15> × 41875773535891952971477<23> × 13403661862710589958293849<26> × 10316589882658148664018432412741304154103858145253645339510927287724805842171756259<83> |