Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 109: | \[{13^{109}-1\over12}\] | 1091 × 2617 × 794018567 × 7730096009<10> × 125025942261588947866880499769668751057693669636754394291266568468102904285433551663774528443041<96> |