Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 221: | \[{6^{221}-1\over5}\] | 239 × 409 × 1123 × 3433 × 4421 × 30839 × 760891 × 39721657 × 41183788762160210182927373892714194450477<41> × 29280915962612879906981038053224349750080435362581534742226261840114605878898030311237732956026099<98> |