Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 75: | \[{13^{75}-1\over12}\] | 3 × 61 × 701 × 1951 × 4651 × 9851 × 30941 × 161971 × 2752135920929651<16> × 185129510660424877123166434146327362331151<42> |