Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
67: | \[{13^{67}-1\over12}\] | 586079017 × 1093561021297<13> × 1195860242597359<16> × 46832111174371450604616850217838043873<38> |