Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 103: | \[{13^{103}-1\over12}\] | 5563 × 9577825183<10> × 299872566772439874463<21> × 1493185475735966076741431<25> × 19026442010188172700578868793469892827183847475034770559<56> |