Base 12 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{12^{81}-1\over11}\] | 37 × 157 × 80749 × 306829 × 5937949 × 86769286104133<14> × 660198074631409<15> × 4813672836681861967666457690352914053<37> |