Base 12 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 131: | \[{12^{131}-1\over11}\] | 263 × 815445233670199794679089054355466496480869783292614187295875299786076215107692911610795388351530437490847296932822002153819841240735668859<138> |