Base 12 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{12^{91}-1\over11}\] | 659 × 4943 × 477517 × 20369233 × 152705150363039<15> × 1091317880778743355464526983<28> × 2763479267390955155925039281253414013<37> |