Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 83: | \[{28^{83}-1\over27}\] | 167 × 39841 × 21661517621<11> × 65642602122533083476691308195970252142124523<44> × 5091332573154034332808866141011655364692094123998293376413<58> |