Base 12 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 76: | \[{12^{76}-1\over11}\] | 5 × 13 × 29 × 3307 × 8209 × 1977673 × 905265296671<12> × 176477034940417<15> × 2016864235215616489<19> × 29043636306420266077<20> |