Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 71: | \[{28^{71}-1\over27}\] | 25828494169<11> × 37313251966817<14> × 857600610882384989993501<24> × 250962707786649416977683047545011125829975942346091801<54> |