Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 257: | \[{6^{257}-1\over5}\] | 9767 × 17477 × 3309693452762216327<19> × 9306689489306197083232219997965248298881691751524941849307<58> × 3673586540800931510375730400071935007467990878958458570282411761897012162305639685693749182381299754408271638230437<115> |