Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 128: | \[{13^{128}-1\over12}\] | 27 × 5 × 7 × 17 × 193 × 257 × 1601 × 2657 × 10433 × 14281 × 441281 × 3230593 × 283763713 × 407865361 × 36713826768408543617<20> × 68675120456139881482562689<26> × 3215877717636198473712500018174097551256193<43> |