Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 173: | \[{5^{173}-1\over4}\] | 1039 × 3461 × 1708272343265311<16> × 339919831020187630960347957199421099342434386629129924807724899548171905079254114627192212342747249<99> |