Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[{7^{260}-1\over6}\] | 24 × 53 × 11 × 53 × 131 × 157 × 191 × 281 × 2801 × 4021 × 157951 × 787021 × 1175071 × 134358901 × 228511817 × 16148168401<11> × 4446437759531<13> × 434502978835771<15> × 1195857367853217109<19> × 35695043869049049222174543845808031<35> × 10231029132426951826057727673749330815378228332102667845417423429495639901<74> |