Base 10 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 69: | \[{10^{69}-1\over9}\] | 3 × 37 × 277 × 203864078068831<15> × 11111111111111111111111<23> × 1595352086329224644348978893<28> |