Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 139: | \[{6^{139}-1\over5}\] | 557 × 21407 × 128159 × 190499431829426403200101169876785677642490596937278842226897447732472637176807419519306808486559<96> |