Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 71: | \[{19^{71}-1\over18}\] | 17041 × 49417 × 19840332702980239<17> × 1367953340395774788360889<25> × 15039779687938609372385845398208131004523<41> |