Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 73: | \[{19^{73}-1\over18}\] | 893943109 × 109796425517837<15> × 391818505243975817655620850033223<33> × 3226690707486553756833988409595477959<37> |