Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 52: | \[{13^{52}-1\over12}\] | 22 × 5 × 7 × 17 × 53 × 13417 × 20333 × 79301 × 264031 × 380329 × 1803647 × 1418792215861230619657<22> |