Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 107: | \[{8^{107}-1\over7}\] | 17866285599391<14> × 162259276829213363391578010288127<33> × 210516800089955301807292488792588188869650399862249<51> |