Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 89: | \[{13^{89}-1\over12}\] | 179 × 9257 × 716164560927079240026189379811<30> × 97149593605438945916118967283170626506454157662777835870622857<62> |