Base 12 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 74: | \[{12^{74}-1\over11}\] | 13 × 3933841 × 5250079 × 4150805645839<13> × 30023720899326796981<20> × 196560666553286126588980353347341<33> |