Base 11 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[{11^{87}-1\over10}\] | 7 × 19 × 523 × 398113 × 54415717 × 303309617049998388989376043<27> × 873360172275048609080552096817243827525632861<45> |